(Reuters) -Ukrainian President Volodymyr Zelenskiy urged the West on Tuesday to tighten sanctions pressure on Kremlin leader Vladimir Putin and to step up its support for Kyiv to ensure that Moscow did not succeed in its war. Western hesitation in its backing for Kyiv and fears of an escalation in the war with Russia were costing time and lives, and could prolong the fighting by years, he told the World Economic Forum in Davos in an emotional speech. With the West’s once-staunch wartime support for Kyiv now wavering amid political wrangling in Washington and Brussels, Zelenskiy said that Europ…