NATO members continued their largest combat exercises of 2025 on Wednesday, testing their ability to rapidly deploy large-scale forces on the 32-nation alliance's eastern border as worries grow over its most powerful member, the United States.

The drills in Romania, which borders Ukraine, come as a shaken Europe grapples with a new U.S. course under President Donald Trump. Defense Secretary Pete Hegseth has demanded that allies dramatically ramp up military spending and said U.S. security priorities lie elsewhere — casting doubts on Washington's longstanding security guarantees provided to Europe.