WASHINGTON (AP) — The Group of 7 world leaders say they won’t recognize results of a referendum for the Crimea region to split from Ukraine and join Russia.

A statement from the seven nations released from the White House on Wednesday calls on Russia “to cease all efforts to change the status of Crimea contrary to Ukrainian law and in violation of international law.” It says the referendum scheduled for this weekend “would have no legal effect” and the process is deeply flawed.