By Phil Stewart and Andrius Sytas VILNIUS (Reuters) -U.S. Defense Secretary Lloyd Austin on Saturday appeared to compare Russsia’s military to a snake that was uncoiling and preparing to strike Ukraine after a massive military buildup that has stoked the biggest East-West crisis since the Cold War. Austin, speaking on a trip to Lithuania, said he agreed with President Joe Biden’s Friday assessment that Russian President Vladimir Putin has made a decision to stage a new invasion of Ukraine. “They are uncoiling and are now poised to strike,” Austin told a news conference in the Lithuanian capita…