Pakistan, June 28 -- The US ambassador to Russia, Lynne Tracy, is departing Moscow, leaving Washington without a top envoy in the country as a rapprochement being pushed by US President Donald Trump falters.

Moscow earlier this week accused Washington of not being "ready" to take steps to restore the normal functioning of their embassies, hobbled by years of tit-for-tat restrictions and expulsions of diplomats.

Trump has not yet nominated a successor to Tracy, the first woman to hold the post and who was appointed by ex-President Joe Biden and is leaving after two-and-a-half years in the role.

Trump has overhauled Biden's policy of isolating Vladimir Putin over his Ukraine offensive, holding several calls with the Kremlin chief and raisi...