Oil prices rose on Monday following fighting in Iraq and Yemen, but Iranian comments that OPEC was unlikely to cut output as well as signs of strengthening U.S. production capped gains. Prices were supported by concerns that conflict in Iraq and Yemen could disrupt supplies after Islamic State militants said they had taken control of the Iraqi city of Ramadi in a big blow to the government. In Yemen, a Saudi-led coalition resumed air strikes against Houthi militia in Aden, a port-city on the shores of key Middle East oil routes.