* Paris attacks keep France's determination to act intact * Hollande says Syria's Assad, Islamic State are same enemy * International community must do more in Libya, Nigeria By John Irish PARIS, Jan 16 (Reuters) - Deadly Islamist attacks on France only reinforce its resolve to act on the international stage, intervening in world hotspots and using its diplomatic weight to help solve crises, President Francois Hollande said on Friday. France, a permanent U.N. Security Council member and nuclear power, has thousands of troops hunting down al Qaeda-linked militants in Africa's Sahel-Sahara region and is part of the U.S.-led coalition striking Islamic State fighters in Iraq.