TOKYO -- By ordering Russia's nuclear forces into high alert on Sunday, President Vladimir Putin has sent a stark warning to the U.S. and Europe that all options are on the table when it comes to Ukraine.
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Nuclear alert makes Ukraine worst standoff since Cuban missile crisis
Vladimir Putin appears to embrace risky 'escalate to de-escalate' planning
Russian troops train with a mobile ICBM launcher. © TASS/Kyodo
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