watch nowMoscow signaled to the West that it's ready for a nuclear confrontation after Ukraine was given permission to attack Russian territory — and appeared to quickly act on that greenlight — using U.S.-made long-range missiles. Ukrainian news outlets reported early Tuesday that the missiles had been used to attack a Russian military facility in the Bryansk border region. The Kremlin has repeatedly warned the West against allowing Ukraine to use its long-range weapons to attack Russia directly. Moscow upped the ante Tuesday as Russian President Vladimir Putin signed a decree approving its updated nuclear doctrine, shifting the parameters on when Russia can use nuclear weapons. "Aggression against the Russian Federation by any non-nuclear state with the participation or support of a nuclear state is considered a joint attack."

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Persons: Vladimir Putin, it's, Dmitry Peskov, Peskov Organizations: Washington Sunday, Ministry of Defense, CNBC, Kyiv Post, Kremlin's, Russian Federation, Civil Defense, Emergencies, Russia's Emergencies Ministry Locations: Moscow, Ukraine, Russian, Bryansk, Russia, Belarus, Republic of Belarus