Latest from Thomas Gibbons-Neff

Russia has denied taking part in the strike, despite a U.S. statement Saturday that specifically indicated Russian aircraft participated in the bombing.

The delay is the byproduct of the American commander’s vision for the war and the alliance's ability to provide the troops required to make it a reality, according to a U.S. official.

The Pentagon is expected to make an official announcement about the troop increase in the coming days.