At UN, US Demands Russia Explain Its Troop Build-up on Ukraine Border

The United States and Russia faced off at the U.N. Security Council Monday over Washington's accusations that Moscow is planning a large-scale invasion of neighboring Ukraine, which the Kremlin has denied.

"The situation we're facing in Europe is urgent and dangerous, and the stakes for Ukraine – and for every U.N. member state – could not be higher," U.S. Ambassador Linda Thomas-Greenfield told council members.