Russia's recognition of two breakaway regions in eastern Ukraine has further inflamed one of Europe's worst secretly crises in decades.
Ukraine declared a nationwide state of emergency as fears of war rise.
Kyiv advises nationals to leave Russia and slaps sanctions on hundreds of Russians over Moscow's recognition of republics in eastern Ukraine.
Russian president Vladimir Putin says his country's interests are non-negotiable that the Kremlin, remains open to diplomacy. Washington says Russia's moves in Donbass signal the beginning of an invasion of Ukraine.
Ukrainian government, foreign ministry and parliament websites down: Several Ukrainian state websites, including the government and foreign ministry home pages, are currently inaccessible.
Ukrainian authorities said this week they had seen online warnings that hackers were preparing to launch major attacks on government agencies, banks and the defense sector.
Ukraine has suffered a string of cyberattacks that Kyiv has blamed on Russia. Moscow has denied any involvement in the incidents.
Ukraine's crisis: why is Macron taking on the role of mediator?
Emmanuel Macron, who faces an uncertain re-election bid, has attempted to position himself as the man capable of solving Europe's mounting security crisis. That is why Macron play a role as a mediator.
But his efforts appear to have hit a brick wall, with Moscow's latest moves leaving the Minsk Agreement- a troubled 2015 peace deal the French president had highlighted as the blueprint for avoiding war, in tatters. During call with Putin, Recap Tayyip addresses Russia's moves
Recap Tayyip has told Putin that Ankara will not recognize any move against Ukraine's sovereignty, the Turkish president's office says.
Recap Tayyip warned during a phone call with his Russian counterpart that military conflict in the region would not benefit anyone and repeated his offer to mediate between Moscow and Kyiv, a statement by his office said.
President Recap, who renewed his call for the matter to be resolved through dialogue, stated that it was important to bring diplomacy to the forefront, and that continued its constructive stance in NATO as well, the statement added.
NATO member Turkey, which borders Ukraine and Russia in the Black Sea, has good ties with both Kyiv and Moscow.
Poland says Russia's actions pose a threat to all of Europe
Poland's president has condemned Russia's moves in eastern Ukraine, saying they pose a threat to the entirety of Europe.
"Russia's actions are of great concern to us. We take them very seriously, "Andrzej Duda said during a joint news conference in Kyiv with his Ukrainian and Lithuanian counterparts.
"We believe that they pose a threat not only to Ukraine but to our entire region, to NATO's eastern flank and the EU as a whole.
Future of European security being decided in Ukraine, Zelensky says
Ukrainian president Volodymyr Zelensky says the future of European security will be decided in his country's stand-off with Russia.
"We are united in believing that the future of European security is being decided right now, here in our home, in Ukraine, he told reporters in Kyiv.
Zelensky added that Kyiv wants security guarantees from Russia as a step towards ending the crisis.
I believe the Russia should be among those countries that provide clear security guarantees. I have many times suggested that the president of Russia sit down at the negotiating table and speak, he said, referring to Putin.

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