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NATO announced an "extraordinary" meeting Tuesday with envoy after Russia recognised two separatist regions in the east of the country as independent.

A statement from the alliance said NATO chief Jens Stoltenberg would brief media at 1600 GMT after the talks with non-NATO member Ukraine.

World leaders scrambled Tuesday to condemnÌýÌýPresident Vladimir Putin — and to signal possible sanctions — afterÌýÌýinto separatist regions of easternÌý.

While Russia's troop movements were still not clear, leaders in Asia and elsewhere voiced strong support for Ukraine's sovereignty, along with worries about how a European war could hurt global and local economies and endanger foreign nationals trapped in Ukraine.

With an estimated 150,000 Russian troops massed on three sides of Ukraine, the U.S. has warned that Moscow has already decided to invade. Still, President Joe Biden and Putin tentatively agreed to a meeting brokered by French President Emmanuel Macron in a last-ditch effort to avoid war.

If Russia moves in, the meeting will be off.

Ukraine and the West have accused Russia of supporting the separatists with arms and troops, but Moscow has denied that, saying that Russians who fought there were volunteers.