Greek F-16 planes “harassed” Turkish military trainer aircraft by putting them under radar-lock while they were flying over the Aegean Sea, the Turkish General Staff said in a statement on Dec. 23.

Turkish aircrafts responded in kind, said the statement.

The Turkish Air Force’s F-16 war jets were performing training flights over the Aegean Sea when two Greek F-16 jets harassed six Turkish planes by placing them under radar lock for 3.5 minutes, said the statement.