Russia is massing yet more troops near Ukraine and an invasion could come at any time, perhaps before the end of this month's Winter Olympics, US Secretary of State Antony Blinken said on Friday.
Moscow, for its part, ramped up its truculent response towards a Western diplomatic push to defuse the crisis, dismissing answers sent this week by the EU and NATO to its security demands as an insult.
Commercial satellite images published by a private US company showed new Russian military deployments at several locations near Ukraine.
In his starkest warning yet to Americans in Ukraine to get out now, President Joe
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