Kyiv unable to contact war prisoners moved to Hungary

Ukraine accuses Hungary of ignoring requests for contact with prisoners of war secretly transferred from Russia. Meanwhile, Russia launches a widespread overnight air attack on Ukraine targeting the capital and other cities. US President Joe Biden says the threat of Russian President Vladimir Putin using tactical nuclear weapons is "real." African leaders visit Ukraine and Russia to call for a cease-fire as high food and energy prices add to economic hardship in their countries. Belarusian President Alexander Lukashenko declares that his country has already received some of Russia's tactical nuclear weapons and warns that he wouldn't hesitate to order their use if Belarus faced an act of aggression.