MOSCOW - The Kremlin feels cautious optimism about the prospects for an improvement in US-Russian relations after Russian Foreign Minister Sergei Lavrov met US President Donald Trump in Washington, a Kremlin spokesman said on Thursday. 'The conversation itself is extremely positive,' Kremlin spokesman Dmitry Peskov said on a conference call with reporters, referring to Lavrov's meeting with Trump on Wednesday. Peskov said the Kremlin viewed the prospects of a thaw 'with cautious optimism.' 'We have a lot of work ahead of us,' he said.