WARSAW, July 30 — Against the backdrop of a reported violation of Polish airspace, the principle of national sovereignty—codified in the Chicago Convention on International Civil Aviation, signed in 1944 and in force since 1947—has once again come under scrutiny in the corridors of NATO and the United Nations. Under international law, any unauthorised entry by a foreign military aircraft into a country’s airspace constitutes a breach of sovereignty. Such incursions are governed by the law of armed conflict and are considered hostile acts.
The wider picture, however, is shaped by the delicate balance between deterrence and the imperative to avoid direct confrontation with a nuclear-armed Russia.
Legal foundations and precedents
Article 2(4) of the UN Charter prohibits the threat or use of force against the territorial integrity of any state. In practice, past incidents show that Moscow typically denies intent and characterises intrusions as accidents. The most recent case follows a pattern of such denials.
NATO members have historically responded to airspace violations with diplomatic protests, enhanced surveillance, and heightened military readiness. One of the most dramatic precedents occurred on November 24, 2015, when Turkey shot down a Russian Su-24 fighter jet after it violated Turkish airspace near the Syrian border.
Turkey subsequently invoked NATO Article 4, prompting consultations among allies. The crisis did not escalate further. Another notable incident unfolded in 1981, when a Soviet Whiskey-class submarine grounded inside Swedish territorial waters—an episode known as the “Whiskey on the rocks” affair—eliciting diplomatic protests from Stockholm.
More recently, after the Przewodów explosion in 2022, Poland summoned the Russian ambassador, who did not attend, and raised the matter at the UN Security Council. NATO responded by reaffirming its support for Poland and continuing its backing of Ukraine without direct military engagement.
In 2023, the United States deployed additional Patriot missile batteries to Poland.
What is at stake now
In the corridors of the alliance, several possible diplomatic and military responses are under consideration. A formal protest note from Poland to Russia would be the first step. An emergency meeting of the NATO North Atlantic Council under Article 4 could follow, as could a request for an investigation by the International Civil Aviation Organization (ICAO).
On the military side, NATO could strengthen air defence in Eastern Europe, and Poland might increase the number of quick-reaction alert (QRA) scrambles or modify its rules of engagement. Yet NATO’s current rules of engagement require visual identification and a warning before any use of force, unless hostile intent is clear.
The alliance must navigate a tense situation, balancing deterrence with the imperative to avoid a direct war against a nuclear-armed adversary. Meanwhile, economic sanctions or further restrictions on Russian airspace remain on the table as additional diplomatic levers. For now, the Polish government has not officially confirmed its next move.
What is clear is that the principle of sovereignty—long the bedrock of international order—faces yet another test on Europe’s eastern flank. The coming days will reveal whether the response follows established precedent or charts a new, more assertive course.
