(QHA) -

The United Nations Security Council has met in emergency session on Ukraine as UN officials warned of a possible return to “full-scale fighting” in separatist-controlled eastern Ukraine.

The November 12 Security Council meeting came hours after NATO’s top commander in Europe said “multiple columns” of Russian tanks, artillery, and antiaircraft units had crossed from Russia into eastern Ukraine since November 10.

Russia says there is no evidence its armed forces are in eastern Ukraine.

There was no proposed UN resolution on November 12 against Russia, which has veto powers on the Security Council.

U.S. Ambassador Samatha Power told the Security Council on November 12 that Russia “talks of peace, but it keeps fueling war” in eastern Ukraine.

International monitors say they’ve seen unmarked military forces bolstering separatist positions in recent days.