Tensions between Russia and the United States over Moscow's troop build-up near Ukraine spilt into the United Nations Security Council on Monday, with both countries accusing each other of being "provocative."

Russia failed to stop the US-requested council meeting on the build-up, allowing for a public face-off over what the United States and other nations called a threat to international peace and security.

The council is unable to take any action beyond talking about the situation as Russia is one of the council's five veto powers...