The new United States Ambassador to Russia has arrived in Moscow, the United States Embassy in Moscowannounced Thursday, for what is expected to be a challenging tenure as Russias war in Ukraine has brought bilateral ties to historic lows.Lynne Tracy, a career diplomat who was a second-ranking official at the embassy from 2014-17, returned to Moscow the day after meeting her Russian counterpart Anatoly Antonov in Washington.Welcome back to Russia, Ambassador Tracy, the United States Embassy said in social media posts accompanied by a photo of the envoy, the first woman to lead the United States mission in Russia.Tracy is expected to present her credentials in the coming days and assume her duties later this month, a CNN reportersaid Tuesday, citing the United States State Department.Tracy landed in the Russian capital shortly after United States President Joe Biden, who nominated her as his next ambassador last fall, announced the delivery of 31 Abrams tanks to Ukraine in a major policy reversal.Moscow has repeatedly threatened Kyivs Western allies over their increasingly lethal arms supplies.The war in Ukraine is the latest friction point between the two superpowers, which have seen their relations fall to post-Cold War lows due to a litany of disagreements.The United States Embassy in Moscow halted non-emergency consular services in 2021 after Moscow banned embassies of so-called "unfriendly" countries from hiring non-Russians.Tracy, who speaks Russian, previously served as the United States Ambassador to Armenia.She has worked at United States diplomatic missions in Kazakhstan, Turkmenistan, Afghanistan and Pakistan.