Vladimir Putin says U.S. sanctions are pushing Russia-U.S. relations into a stalemate . President Barack Obama says Russia failed to take steps to end Ukraine conflict . The United States and the European Union imposed new economic penalties on Moscow over its actions in Ukraine. The Pentagon says Russia has increased troops at Ukraine 's border .
Vladimir Putin says U.S. sanctions are pushing Russia-U.S. relations into a stalemate . President Barack Obama says Russia failed to take steps to end Ukraine conflict . New sanctions target Russian banks , energy , defense firms , as well as Ukraine separatists . The Pentagon says Russia has increased troops at Ukraine 's border .