The United States says it is partially lifting a 33-year arms embargo on Cyprus, drawing a strong rebuke from Turkey, at a time of escalating tensions in the eastern Mediterranean.

Turkish President Recep Tayyip Erdogan warns Greece against making mistakes that would pave the way to its “ruin,” as the two countries remain locked up in a dispute over energy resources in the sea.

Greece says Turkey is attempting to encroach on its territorial waters and threatening the cohesion of NATO through “illegal and provocative behavior” in the eastern Mediterranean Sea.