KYIV, Feb 28 - Ukrainian pilots have arrived in Poland to start the process of taking control of fighter planes they expect to be donated by European countries, a Ukrainian government official told POLITICO.

The potential transfer of older Russian-made planes to be used in combat against Russian forces could be the most significant moment yet in a wave of promised arms transfers over the past 24 hours that includes thousands of anti-armor rockets, machine guns, artillery and other equipment.