Monday's top stories in 10 minutes

US President threatens new auto and steel tariffs on Canada, after trade talks collapse over weekend. The Carney government strategizes over response to $28 billion in new US levies, as Canadian premiers push back against US tariff threats. New documents obtained by CBC News show US owner of Ambassador Bridge met with senior Canadian officials prior to the Gordie Howe Bridge's opening.  Ukraine marks 35 years of independence from the Soviet Union amid Russia war, as allies hold summit in Kyiv. New study by the Centre for Addiction and Mental Health shows mental health of Ontario youth still a concern, but there may be signs of a shift in the trend.