By Samia Nakhoul and Nick Tattersall ANKARA/WASHINGTON (Reuters) - Turkey is ruling out compromise with the United States over the involvement of Kurdish militia fighters in an assault in Syria, an obstacle for Washington's plan to deploy its strongest allies on the ground in a decisive showdown with Islamic State. Donald Trump has made defeating Islamic State one of the key goals of his presidency, and his new administration received a draft Pentagon plan on Monday to accelerate the campaign. Raqqa in Syria, one of Islamic State's two de facto capitals along with Mosul in Iraq, is expected to be the scene of the final battle to crush the jihadists' self-proclaimed Caliphate sometime this year, after a U.S.-backed Iraqi government assault on Mosul already under way since October.



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