NATO member states, including Poland, Estonia, and Romania, have accused Russia of violating their airspace, leading to significant diplomatic tensions. UK Foreign Secretary Yvette Cooper addressed the UN Security Council, warning that NATO is prepared to defend its territory against unauthorized incursions. Polish Foreign Minister Radoslaw Sikorski stated that any Russian aircraft entering Polish airspace would be shot down. Russia has denied these allegations, with its deputy ambassador to the UN calling them unfounded. The incidents, including Russian MiG-31 jets entering Estonian airspace, are seen as tests of NATO's resolve. The situation is further complicated by ongoing military actions in Ukraine, where NATO forces have engaged directly for the first time since the conflict began. The US has reiterated its commitment to defend NATO territory, while discussions on European security continue.