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a good sunday evening to you. i'm jim sciutto, and this is cnn's special live coverage of the extraordinary events this weekend out of russia. moscow's red square blocked off again today after the brief but stunning insurrection that's gripped the world, could perhaps weaken vladimir putin's grip on his country. we should note it's far too soon to know. so much we don't know about what led wagner mercenary group leader yevgeny prigozhin to launch a march on moscow and what convinced him to abruptly call it off. and then, it's said, go into exile. u.s. secretary of state tony blinken ...

I think we're seeing a parallel here with make sure if you're going to go into a vehicle, whether it's an aircraft or a surface craft or submersible that it's been through certifying agencies, that it's been signed off. >> seems like a basic point, doesn't it? while the u.s. coast guard is leading efforts to determine how the titan sub imploded, canada has its own investigation under way to determine the possibility at least of criminal liability for those five people killed on board. an effort complicated by the fact that oceangate's founder and ceo, stockton rush, once made comments about br...