 Meanwhile, U.S. President Joe Biden and U.K. Prime Minister Boris Johnson have condemned Russia's forces invading Ukraine. They made their disappointments known in tweets, which came shortly after Russia's President Vladimir Putin told Russian state TV he had authorized a military operation in eastern Ukraine and explosions were heard in the Ukrainian city of Kiev and the breakaway eastern Ukrainian city of Donetsk. Biden tweeted that Russia alone is responsible for the death and destruction this attack will bring and the United States and its allies and partners will respond in a united and decisive way.