Kiev, Ukraine — Russian troops launched their anticipated attack on Ukraine on Thursday, as President Vladimir Putin cast aside international condemnation and sanctions and warned other countries that any attempt to interfere would lead to “consequences you have never seen.”

Ukraine’s leadership said at least 40 people have been killed and dozens are wounded so far in what it called a “full-scale war” targeting the country from the east, north and south.

“The army and national solidarity are the mainstay of Ukrainian statehood,” Ukrainian President Volodymyr Zelenskyy said on Thursday. “Our military needs this support … The future of our Ukrainian people depends on every citizen. Everyone who has combat experience and can join the defense of Ukraine.”

He encouraged Ukrainian citizens to donate blood to assist wounded troops. The president’s remarks follow an announcement that the country was hit with a second wave of missile strikes, according to one of his advisors.

NATO’s secretary-general Jens Stoltenberg said Thursday that Russia has launched war on Ukraine and shattered peace on the European continent. He called for a summit of NATO alliance leaders for Friday.