OTTAWA—Canada is extending and expanding its mission to train Ukrainian soldiers but it is not, so far, prepared to help arm them with lethal defensive weapons as Ukraine has requested. Prime Minister Justin Trudeau is not, however, categorically ruling out sending weapons in future. Asked repeatedly Wednesday why Canada is not sending weapons, he did not specifically answer but left the door open. “We continue to look for ways to be helpful to the Ukrainian people as they stand up for their rights to live in a democracy, to choose the course of their country, to defend their territorial integrity. This is something we are unequivocal on,” Trudeau told a news conference at the end of a three−day cabinet retreat. “We will continue to monitor the situation closely and stand by our Ukrainian friends as we look to give them the support that they need.” Trudeau announced a $340−million commitment …