War and Neutrality

War in Modern Public International Law

War is the organized use of armed force between States or entities treated as belligerents, but modern public international law no longer regards war as an ordinary means of settling disputes. The governing distinction is between jus ad bellum, which concerns the legality of resorting to force, and jus in bello, which regulates conduct once an armed conflict exists.

The Philippine Constitution reflects the modern rule by renouncing war as an instrument of national policy and by adopting generally accepted principles of international law as part of the law of the land. This constitutional policy rejects aggressive war, but it does not disable the State from defending itself, joining collective security measures, or complying with international humanitarian law when armed conflict occurs.

Under the Constitution, Congress has the sole power to declare the existence of a state of war by the required vote of both Houses voting separately in joint session. This is a domestic allocation of war powers. Internationally, an armed conflict may exist even without a formal declaration, because the controlling fact is the resort to armed force and the legal consequences attached to it.

The President, as commander-in-chief, directs the armed forces and may respond to invasion, rebellion, or lawless violence within constitutional limits. Domestic authority to use force must still be exercised consistently with treaty obligations, customary international law, and the statutory implementation of international humanitarian law.

Prohibition on the Use of Force

The basic rule is that States must refrain from the threat or use of force against the territorial integrity or political independence of any State. Force is not made lawful by labeling it reprisal, punishment, rescue, pressure, or enforcement of policy when it is not justified by a recognized exception.

The principal exceptions are self-defense and collective security measures. Self-defense may be individual or collective, and it presupposes an armed attack or circumstances recognized by international law as triggering the inherent right to defend the State. The defensive response must be necessary and proportionate to the attack or imminent threat recognized by law.

Collective security measures are those authorized through the United Nations system to maintain or restore international peace and security. When the Security Council validly requires or authorizes enforcement action, the resulting obligations may prevail over inconsistent claims of neutrality or non-participation.

A formal declaration of war does not legalize aggression. Conversely, the absence of a declaration does not prevent the application of the law of armed conflict once hostilities between States reach the legal threshold of an international armed conflict.

War, Armed Conflict, and Related Conditions

International humanitarian law uses the existence of armed conflict, not the political description chosen by the parties, as its trigger. The legal label used in speeches, statutes, or communiques cannot remove minimum protections for persons not taking part in hostilities.

Legal Effects of War

War or international armed conflict produces consequences in both international and municipal law. Diplomatic relations may be severed, consular functions may be limited, and a protecting power or humanitarian organization may perform substitute functions when accepted by the parties.

Treaties are not automatically extinguished by war. Treaties whose object is incompatible with hostilities may be suspended or terminated between belligerents, while treaties establishing boundaries, territorial status, humanitarian obligations, human rights protections, diplomatic safeguards, or rules specifically designed for war ordinarily continue according to their nature.

Private rights do not disappear merely because States are at war. Enemy aliens, enemy property, contracts, ships, cargo, insurance, and commercial dealings may be restricted by valid war measures, but confiscation, detention, or disability must rest on a lawful basis and remain subject to applicable constitutional and international limits.

War also affects the legal character of acts that would otherwise be ordinary crimes, torts, or commercial conduct. An act may become a lawful act of war, a war crime, a prohibited reprisal, an unlawful taking, or a neutral violation depending on the actor, target, purpose, means used, and applicable status of persons and property.

Participants and Objects of Attack

The law of war distinguishes between combatants and civilians, and between military objectives and civilian objects. Only combatants and military objectives may be directly attacked. Persons hors de combat, medical and religious personnel, wounded and sick persons, shipwrecked persons, detainees, and civilians not directly participating in hostilities are protected from direct attack.

A military objective is an object which by its nature, location, purpose, or use effectively contributes to military action and whose destruction, capture, or neutralization offers a definite military advantage. Civilian objects become vulnerable only for such time and to such extent as they are used or converted for military purposes.

The governing operational principles are distinction, military necessity, proportionality, precautions in attack, and humane treatment. Military necessity permits only measures not forbidden by international law and genuinely needed to defeat the enemy; it is not a license to disregard protected status.

Proportionality prohibits an attack expected to cause incidental civilian harm excessive in relation to the concrete and direct military advantage anticipated. The duty to take precautions requires feasible steps to verify targets, choose means and methods that reduce civilian harm, and cancel or suspend attacks when the target or expected effects are unlawful.

Subtopics such as treatment of civilians and prisoners of war rest on this larger structure. Civilians are protected because they are not combatants, while prisoners of war are protected because lawful capture removes them from active hostilities and places them under the detaining power's responsibility.

Means and Methods of Warfare

Belligerents do not have an unlimited choice of means and methods of warfare. Weapons and tactics are unlawful when they are indiscriminate, cause superfluous injury or unnecessary suffering, are directed at protected persons, or are used in a manner prohibited by treaty or customary law.

Perfidy is prohibited because it kills, injures, or captures by abusing an adversary's confidence in legal protection, such as feigning surrender, civilian status, protected medical status, or protected emblem use. Ruses of war remain lawful when they mislead the enemy without betraying a legal protection, such as camouflage, decoys, feints, and misinformation not amounting to perfidy.

Reprisals during armed conflict are exceptional and heavily restricted. They may not be directed against protected civilians, prisoners, the wounded and sick, medical units, cultural property, or other protected persons and objects. Armed reprisals in peacetime are generally inconsistent with the prohibition on the use of force.

Starvation of civilians as a method of warfare, attacks on indispensable civilian survival objects, hostage-taking, collective penalties, pillage, torture, outrages upon personal dignity, and denial of fair trial guarantees are prohibited regardless of military frustration or retaliation.

Occupation and Control of Territory

Occupation exists when territory is actually placed under the authority of a hostile army and that authority can be exercised. Occupation does not transfer sovereignty. The occupying power administers the territory temporarily and must respect existing laws unless prevented, restore and ensure public order and civil life as far as possible, and protect the population.

The occupying power may take security measures, requisition resources under legal limits, and regulate administration, but it may not annex the territory, compel allegiance, deport protected persons, transfer its own civilian population into the occupied territory, or permanently alter institutions except as allowed by security needs or the welfare of the population.

Termination and After-Effects

Hostilities may stop through ceasefire, armistice, capitulation, withdrawal, Security Council action, or peace agreement. A ceasefire or armistice suspends military operations under agreed terms but does not by itself settle all legal consequences of the war unless the instrument so provides.

Termination of war does not erase responsibility. States may incur responsibility for aggression, unlawful occupation, breaches of neutrality, or violations of humanitarian obligations, while individuals may incur criminal liability for war crimes, genocide, crimes against humanity, and other offenses recognized in Philippine implementing law and international law.

Command responsibility attaches when a superior knew or should have known that subordinates were committing or about to commit covered crimes and failed to prevent them or punish the offenders. Superior orders do not excuse manifestly unlawful acts, although they may be relevant only within the narrow limits allowed by criminal law.

Neutrality

Neutrality is the legal status of a State that is not a party to an international armed conflict and intends to remain outside the hostilities. It gives the neutral State rights against belligerents and imposes duties toward all parties to the conflict.

Neutrality is not indifference. A neutral State may condemn violations of law, maintain diplomatic relations, protect its nationals, continue ordinary commerce subject to neutrality rules, and participate in humanitarian action. What neutrality forbids is participation in hostilities or unequal assistance that makes the neutral State a participant in the conflict.

Kinds of Neutrality

Neutrality may be proclaimed, but the status and duties may arise from conduct and circumstances even without a formal proclamation. A proclamation clarifies policy for officials, nationals, ports, vessels, aircraft, and foreign belligerents, but it cannot excuse acts inconsistent with neutrality.

Duties of a Neutral State

The three central duties of neutrality are abstention, prevention, and impartiality. Abstention means the neutral State must not take part in hostilities, furnish troops, provide warships or combat aircraft, or allow its organs to aid one belligerent's military operations.

Prevention means the neutral State must use due diligence to prevent its territory, territorial sea, archipelagic waters, internal waters, airspace, ports, roads, communications systems, and other facilities from being used as a base of belligerent operations. The duty is one of vigilant enforcement within the State's capacity, not a guarantee against every clandestine private act.

Impartiality means restrictions or permissions relating to belligerents must be applied evenhandedly. If a neutral State allows limited port access, repairs, supplies, or passage under neutral rules, comparable access must be available to all belligerents on the same terms, subject to security and humanitarian limits.

A neutral State must not permit recruitment of combatants, organization of expeditions, fitting out of armed vessels, establishment of military communications, launching of attacks, or movement of belligerent forces from its territory. Belligerent troops entering neutral territory must generally be interned so they cannot return directly to hostilities.

The neutral State may enforce its neutrality by disarming belligerent troops, detaining belligerent military assets that violate neutral territory, expelling or limiting belligerent warships, regulating exports, and prosecuting neutrality violations under domestic law. These enforcement measures are not hostile acts when they are impartial and legally required.

Rights of a Neutral State

The territory of a neutral State is inviolable. Belligerents may not move troops through it, attack targets within it, establish bases in it, recruit there, use its ports as operational stations, or conduct hostilities in its territorial waters or airspace.

A neutral State may defend its neutrality with force when necessary. Resistance to a violation of neutral territory is not participation in the war if it is limited to protecting neutral rights and is applied consistently against all belligerents.

Neutral nationals generally remain free to engage in ordinary commerce at their own risk unless domestic law restricts such trade. The State itself must avoid furnishing war material or military support to one belligerent as a public act, while private trade may be exposed to capture or regulation under the law of contraband, blockade, and prize.

Neutral Commerce, Contraband, and Blockade

Neutral commerce is lawful in principle, but it is subject to belligerent rights recognized by the law of naval warfare. A belligerent may visit and search neutral merchant vessels on the high seas to determine enemy character, contraband, breach of blockade, or unneutral service, subject to legal limits and humane treatment of persons on board.

Contraband consists of goods susceptible of military use and destined for enemy forces or enemy war operations. Arms, ammunition, and military equipment are classic contraband. Dual-use goods may become contraband when their destination, use, or circumstances connect them to the belligerent's military effort.

A blockade is binding only when it is declared or notified, effective, impartial, and lawful in purpose and method. A paper blockade that is not actually maintained cannot justify capture. A blockade must also comply with humanitarian limits and may not be used as a device for unlawful starvation or indiscriminate harm to civilians.

Ships or cargo captured for contraband, blockade breach, or unneutral service are ordinarily brought before a prize court or comparable lawful process. Capture without adjudication, destruction without necessity, or treatment of merchant crews as criminals merely for neutral trade may violate international law.

Neutrality in Sea, Air, and Archipelagic Contexts

For an archipelagic State such as the Philippines, neutrality has special maritime and air dimensions. Neutral duties extend to internal waters, archipelagic waters, territorial sea, ports, roadsteads, and national airspace, while rights and freedoms in exclusive economic zones and the high seas remain governed by the law of the sea and the law of armed conflict.

Belligerent warships may be admitted to neutral ports only under neutral regulations, distress rules, or other lawful limits. Traditional neutrality practice restricts the duration of stay, repairs, supplies, and departure sequencing so that a neutral port does not become a naval base or safe operational cycle for one belligerent.

Neutral airspace is inviolable. Belligerent military aircraft may not fly through, attack from, refuel in, or conduct reconnaissance from neutral airspace. A neutral State may require landing, intern aircraft and crews, or use necessary force to end violations of its airspace.

Loss or Qualification of Neutrality

A State loses neutrality when it becomes a party to the conflict, authorizes its territory for belligerent operations, commits its armed forces to one side, or gives military assistance that amounts to participation in hostilities. The test is functional, not merely verbal; a State cannot preserve neutrality by declaration while acting as a belligerent in substance.

Humanitarian assistance, medical relief, evacuation of civilians, protection of refugees, and impartial aid to victims do not by themselves destroy neutrality. Assistance must be humanitarian in purpose, non-discriminatory in principle, and separated from military operations.

Membership in the United Nations and obligations under collective security may qualify traditional neutrality. A State complying with binding collective security measures is not violating neutrality merely because the measure disadvantages an aggressor or supports restoration of peace under international authority.

Defense treaties, visiting forces arrangements, basing access, and logistical cooperation must be assessed by their actual operation during a conflict. Their existence alone does not automatically make a State a belligerent, but their wartime use for attacks, targeting, refueling combat missions, or operational command may implicate neutrality and responsibility.

Consequences of Breach

A belligerent that violates neutral territory commits an internationally wrongful act and may incur responsibility to the neutral State. The neutral State may demand cessation, reparation, release of persons or property unlawfully taken, and guarantees against repetition.

A neutral State that knowingly permits its territory to be used for belligerent operations may incur responsibility to the injured belligerent and may lose the protection attached to neutral status for the specific conduct involved. Failure to exercise due diligence can be enough when the State had knowledge, capacity to act, and a legal duty to prevent the violation.

Neutrality does not suspend the obligations of humanity. Whether a State is belligerent, neutral, or acting under collective security, it remains bound by applicable humanitarian law, human rights obligations, refugee protection principles, and domestic constitutional limits on the treatment of persons under its jurisdiction or control.