Some of America's closest European allies say they're already in a gray zone between peace and war with Russia.

A blast ripped through Poland’s vital Warsaw-Lublin railway line early Sunday, shattering the calm near the village of Mika and sending shockwaves across Europe. The explosion, caused by military-grade C4,

Russia's mysterious UVB-76 radio station sent coded messages mentioning Latvia. This has fueled fears of a Russian attack and a possible World War III. The station, known as 'The Buzzer,' is linked to Russia's military communication.

While the U.S. has taken part in previous iterations of the military exercise, this year's U.S. footprint was smaller as allied nations are pressed by the Trump administration to put more into European defense.

A spokesperson for Poland's special services minister accused Russian intelligence Tuesday of orchestrating a railway blast that destroyed a key track on a route used to deliver aid to Ukraine. Jacek Dobrzyński told reporters that "everything indicates" Russian intelligence was behind the sabotage of Polish railways.

NATO fighter jets were scrambled and ground-based air defense systems put on high alert in Poland and Romania during an overnight Russian attack on Ukraine.

NATO scrambled fighter jets in Polish and Romanian airspace overnight as Russia carried out massive drone and missile strikes in western Ukraine, killing at least 25 people, three of them children.