Feb 14 (Reuters) - Futures for Canada's main stock index fell on Monday, hit by souring risk sentiment across global equities following warnings that Russia could invade Ukraine at any time. Canada has temporarily withdrawn its Ukraine-based military personnel to an undisclosed destination in Europe, the Canadian defence ministry said on Sunday, as Western countries fear Russia is preparing to invade Ukraine. A pandemic-driven exodus of young families out of Canada's largest cities has depleted a core age group of workers from the already tight labor market, which experts say risks accelerating wage inflation in certain industries.