Russian President Vladimir Putin ordered his military command to put nuclear-armed forces on high alert as Ukrainian fighters defending the city of Kharkiv said they had repelled an attack by invading Russian troops reut.rs/341JY3S 
President Vladimir Putin's order to put Russian nuclear forces on high alert is part of a pattern of Moscow manufacturing threats to justify aggression, White House Press Secretary Jen Psaki said reut.rs/35cgKQh
Two Russian billionaires, Mikhail Fridman and Oleg Deripaska, called for an end to the conflict triggered by President Vladimir Putin's assault on Ukraine, with Fridman calling it a tragedy for both countries' people reut.rs/3plic9W
In pictures: Inside the battle for Ukraine reut.rs/3soeKNG
European nations and Canada moved to shut their airspace to Russian aircraft, an unprecedented step aimed at pressuring President Vladimir Putin to end his invasion of Ukraine, the biggest attack on a European state since World War Two reut.rs/3C0RgRN
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