Poland's armed forces say that four U.S. Thunderbolt II attack planes are training for the first time in Poland as part of a security reassurance mission.

U.S. land and air forces are training in eastern Europe as part of NATO's Atlantic Resolve operation, which aims to confirm the alliance's readiness to defend its members should their security be threatened by the conflict in Ukraine.

The spokesman for Polish Army command, Lt. Col. Artur Golawski, said Thursday that four Thunderbolt aircraft, capable of destroying tanks, are based in Powidz this week. The jets are training over southern Poland this week with Poland's F-16 and Su-22 fighters, he said. U.S. C-130 Hercules transport planes are also taking part in the exercise.

The Thunderbolt planes fly to Germany in Friday.