Earlier, Vladimir Putin had warned that he would use nuclear weapons to defend Russian territory after annexing four regions of Ukraine last month.
On Friday, Russian President Vladimir Putin warned of a 'global catastrophe' if NATO troops directly contact or clash with the Russian army.
Reuters quoted Putin as saying, "In any case, direct contact, direct clash of (NATO) troops with the Russian army is a very dangerous move which could lead to a global catastrophe. I hope that those who are saying this are smart enough not to take such a step."
Putin was speaking in Kazakhstan's capital Astana.
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Earlier, Putin had warned that he would use nuclear weapons to defend Russian territory after annexing four regions of Ukraine last month, a move which the UN this week condemned.
On Tuesday, the Group of Seven (G7) nations warned that the use of nuclear weapons on Ukraine will have severe consequences, according to a statement released by the White House. Leaders of G7 states (the UK, Germany, Italy, Canada, the US, France, and Japan) said, "We deplore deliberate Russian escalator steps, including the partial mobilization of reservists and irresponsible nuclear rhetoric, which is putting global peace and security at risk. We reaffirm that any use of chemical, biological or nuclear weapons by Russia would be met with severe consequences."
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Earlier, US President Joe Biden spoke of nuclear "Armageddon" in a warning about the escalation in Russia's war in Ukraine during a speech on Thursday.
Putin has renewed his nuclear threats as he announced the annexation of Ukrainian territory, some of which Russia doesn't control, and with the call-up of 300,000 reservists to reinforce his flagging invasion.
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