Exercising Restraint: Situating Poland’s Strategy vis-à-vis NATO’s Collective Defense

On July 30th, a projectile object landed in Tarnawa-Kolonia, a village in eastern Poland. Upon further investigation, this object was identified as a Russian Kh-101 cruise missile. An F-16 was scrambled in defense, although the strike appeared to have been unintended and aimed at Ukraine instead, according to Polish officials. Despite this, it remains that the strike was a foray into NATO territory, intended or not, and may provide grounds for NATO reinforcements in Poland. However, Poland has primarily exercised restraint as a tool of deterrence against further incursions amid growing fears of war spillover from Russia-Ukraine. Against this context, the question remains: why has Poland avoided invoking NATO’s collective defense clause? Is it because of the strike was unintended, or is it evidence of a growing shift away from NATO itself?

NATO’s Collective Defense: Articles 4 and 5 of the Treaty

The North Atlantic Treaty Organisation, or NATO, was a product of the Cold War era, a bloc created to counter the USSR. NATO and its Soviet counterpart, the Warsaw Pact, served as military alliances balancing power against each other. This dynamic of deterrence ensured that the Cold War did not devolve into a third World War (the Cuban Missile Crisis of 1962 was the closest that both parties came into all out war, apart from proxy wars in different geographies). After the disintegration of the Soviet Union in 1991, NATO took on a different role – rather than playing the role of deterrence against a mutually powerful adversary, it became a tool to further American power with the help of its growing camp of allies. The fundamental principle of NATO has remained unchanged throughout: collective defense in the face of external threat.

Article 5 of the North Atlantic Treaty states that an “armed attack against one or more of them (the Parties to the treaty)… shall be considered an attack against them all” and that the parties may take any action, including the use of force, in accordance with Article 51 of the UN Charter allowing for self defense in the event of aggression. This clause is the underlying principle behind NATO’s collective defense. The organization of NATO troops, however, ensures that there is already a military presence in key regions comprising of national troops and selective allied troops (around 5,000 allied troops as of 2019). NATO forces are not required to actually come together unless regionally concentrated troops are unable to deter external aggression.

Prior to mobilizing collective troops, NATO’s defense mechanism also comes under Article 4 of the treaty, calling for a consultation of council members in circumstances wherein any party is under credible external threat. This clause enables NATO members to put all their cards onto the table and demonstrate the extent of their current defense capabilities. Upon reaching a consensus on collective capacities and approaches, consultation may lead to actionable strategy against the threat. Poland has invoked Article 4 twice, once in 2014 and once in 2025, both due to increasing Russian aggression in nearby Ukraine and fears of war spillover. After the 2025 invocation, Mark Rutte, Secretary General of NATO, stated that NATO advanced air defense systems were mobilized for Poland’s protection. These included ISR (Intelligence, Surveillance, and Reconnaissance) systems to gain a comprehensive understanding of the nature of the threat. NATO aircrafts aided in securing Polish airspace preemptively against a drone attack in 2025.

Why hasn’t Poland invoked Article 4 now?

In the case of the Tarnawa-Kolonia strike, however, the Polish government framed it as unintended – not actually meant to have hit Poland at all. Given the nature of the strike, i.e. that no one was hurt and that it appeared to have been Ukraine-bound, Poland did not petition for Article 4. This move could also be seen as a deliberate act of restraint, choosing not to escalate the attack into something less manageable. Regardless of whether the strike was intended or not, the fact remains that it was a foray into NATO territory. In addition to this, the Poland missile incident is not solitary in nature, it comes as part of a larger observable pattern of Russian aggression into NATO’s sphere of influence. Poland’s exercise of restraint, both in classifying the strike as unintended and also in not invoking Article 4, may be telling of NATO’s dwindling relevance. Poland has been expanding its military, especially due to the Russia-Ukraine war. Polish army expansion has helped NATO reinforce its eastern flank. Practically, today’s NATO provides a crucial asset: its organisational framework and ISR systems. The Polish army has been heavily investing in novel ISR technology, making itself self-sufficient in this regard. What then, does today’s NATO have to offer to a member state such as Poland?

When Poland invoked article 4 after last year’s drone swarm, it was within the context of a more reliable NATO defense mechanism. Today’s context is different. Trump’s volatile demands to increase NATO member countries’ defense spending, alongside his threats to annex Greenland, have left European NATO countries in doubt of the organisation’s dependability. Despite acceding to Trump’s demands for increased defense spending, the US president abruptly cancelled the stationing of 4,000 troops in Poland. He then proceeded to send 5,000 troops to the country, highlighting the irregularity and lack of reliability in America’s NATO strategy. Perhaps Poland is seeking to establish a geopolitical strategy distinct from NATO posturing due to its proximity to Ukraine, instead of relying on a defense mechanism subject to unpredictability. The discourse on the intent behind the attack and deciding to exercise restraint, therefore, calls for a deeper examination of Poland’s geopolitical realities and understanding how the country can maintain a level of deterrence against Russia to avoid costly conflict escalation.