Tillerson faces tough talks in Moscow amid increased tensions

By Lesley Wroughton and Yeganeh TorbatiWASHINGTON (Reuters) - U.S. Secretary of State Rex Tillerson's visit to Moscow this week will be an early test of whether the Trump administration can use any momentum generated by a missile attack on a Syrian air base to craft and execute a strategy to end the Syrian war.Now, Tillerson, a former oil executive with no diplomatic experience, is charged with avoiding a major U.S. confrontation with Russia while exacting some concessions from Moscow.