Group 1 - The core event involves the collapse of two bridges in Russia's Bryansk and Kursk regions, which were reported as terrorist attacks, resulting in at least 7 deaths and over 70 injuries [1] - Ukrainian President Zelensky announced that the Ukrainian Security Service had prepared for the drone attacks on Russian airports for a year and a half, deploying 117 drones in the operation [1] - The Russian Defense Ministry reported that several military airports in Russia were attacked by Ukrainian drones, resulting in damage to 41 aircraft, including strategic bombers [1] Group 2 - A Ukrainian delegation, consisting of 14 members and led by Defense Minister Reznikov, has been approved to participate in the upcoming negotiations with Russia in Istanbul [2] - The negotiations are scheduled to take place on June 2 at 1 PM local time in the Çırağan Palace in Istanbul [3]