Dmytro Kuleba is minister of foreign affairs, Ukraine
Large explosions were visible near Kharkhiv, Ukraine's second-largest city, minutes after the Russian president, Vladimir Putin, delivered a speech declaring the beginning of a military operation in Ukraine.
Putin has just launched a full-scale invasion of Ukraine.
Peaceful Ukrainian cities are under strikes
The United States has said it would continue to supply "defensive" weapons to Ukraine against a Russian invasion and deploy US troops to reinforce NATO allies in Eastern Europe.
Putin centers on the fact that Ukraine has pursued membership in NATO, the Western alliance that's led by the U.S.
Putin is saying if Ukraine were to someday join NATO and the U.S. were to put weapon systems in Ukraine, he's calculating in his head the risks that would present to his government in Moscow.