Older-generation aircraft would be in exchange for sending 12,000 troops to the frontline of the war with Ukraine

Iskander missile strike hit Mirgorod Air Base, 100 miles from the border. Number of planes damaged cannot be verified

The incident occurred on March 14 and ended with the destruction of the unmanned aircraft after the Sukhoi jet collided with one of its propeller blades

United States European Command confirmed unmanned aircraft suffered a collision with a Russian Su-27 fighter and ended up destroyed

Two Russian jets intercepted a US Air Force bomber over the Black Sea and passed 100 feet from the nose of the B-52, as shown in a video released by the Pentagon