Liana Markunina and Leonid Markunin are among the first Ukranians to arrive in Canada since Russia invaded a month ago. They already had visitors’ visas because they have two sons who live in Toronto. They had been hoping to eventually immigrate here under the family reunification program. Instead they fled their home in Odesa to escape Russian bombing. Libby Znaimer talked with them, through a translator, about their harrowing journey. AND This week, Vladimir Putin’s press secretary reiterated the Russian dictator’s most potent threat - that he may resort to nuclear weapons. Dmitri Peskov’s comment had western defense experts worrying about the true level of threat. We reached Michael Krepon, Co-founder of the Stimson Center, a Washington think tank and author of "Winning and Losing the Nuclear Peace".