Ukrainian President Volodymyr Zelensky warned on Sunday that war is returning to the Russian territory, as his country's counteroffensive makes headway. Zelenskyy made the remarks after Russia claimed downing three Ukrainian drones on Sunday, with two of them crashing into office buildings. Dmitry Medvedev, former Russian president and deputy chairman of Russian's Security Council, said Moscow will be forced to use a nuclear weapon if Kyiv's counteroffensive is a success.