Obama - U.S., Europe need to work to ensure monitoring of Ukraine ceasefire

WASHINGTON (Reuters) - President Barack Obama said on Monday that Europe and the United States need to work to ensure there is effective international monitoring of a ceasefire in eastern Ukraine.

Obama, speaking to reporters before meeting with European Council President Donald Tusk, said it was "somewhat ironic" that Republican senators warned Iran about a potential nuclear deal with the United States, calling it "an unusual coalition" between Republicans and "Iran hard-liners."