Obama to Meet Top Security Aides amid Ukraine Crisis, Syria Deliberations

U.S. President Barack Obama will meet top national security aides on Thursday, amid accusations Russia has sent troops into Ukraine and as he deliberates possible strikes in Syria against Islamic State militants.

Obama will gather members of his National Security Council, which includes the secretaries of state and defense, intelligence chiefs and top military brass, in the secure Situation Room of the White House at 2000 GMT, officials said.

Vice President Joe Biden, who is traveling in Pennsylvania, will join the meeting by a remote secure line.

The session will take place after Ukraine accused Russia of a "direct invasion" of the eastern part of the country, allegations which will be the subject of an emergency U.N Security Council meeting at 1600 GMT on Thursday.