Former Russian President Dmitry Medvedev warned that Ukraine joining NATO would be a declaration of war against Moscow, urging NATO to act with prudence to avoid global catastrophe. NATO leaders recently pledged support for Ukraine’s path to membership but did not specify a timeline. Medvedev, now deputy chairman of Russia’s Security Council, emphasized that Ukraine’s membership poses a direct threat to Moscow’s security and criticized NATO’s expansion. He reiterated that Russia would respond increasingly harshly to NATO’s actions, maintaining a standard Kremlin stance since the 2022 invasion of Ukraine.