Article 4 of the North Atlantic Treaty Organization is not as well known as its Article 5 collective security guarantee — which says an attack on all is an attack on one — but it is being increasingly invoked,

Russia's Defense Ministry said it did not target Poland, while Belarus, a close ally of Moscow, said it tracked some drones that “lost their course” because they were jammed.

Russia for the first time deliberately attacked Poland, and just two days later, together with Belarus, began saber-rattling at the Zapad-2025 exercises. RBC-Ukraine explains how these events have affected the negotiation process.