The Polish army sent a letter to the Ukrainians. It's about the drone incident in Lithuania

The Polish military is investigating a potential violation of its airspace by Ukrainian drones during attacks on Russia. Prime Minister Donald Tusk confirmed that Poland has not allowed operations over its territory without explicit consent. A recent incident involved a Ukrainian drone that entered Lithuanian airspace, leading to NATO jets being scrambled. The drone, which exploded in Lithuania, was confirmed by Ukrainian officials to have lost contact during operations targeting Russian military objectives. The cause of the explosion remains unclear, but Ukraine has apologized for the incident.