整理：俄乌冲突最新24小时局势跟踪（6月2日）

Conflict Situation - Ukrainian military claims to have attacked multiple Russian military airports [4] - For the first time, a military base in Siberia, Russia, was attacked [4] - Ukrainian training facility was hit by Russian missiles, resulting in 12 soldier fatalities [4] - Russian Defense Ministry confirms occupation of Oleksiyivka in Sumy region, Ukraine [4] - Russian Defense Ministry acknowledges drone attacks on multiple airports in Russia, causing fire to aviation equipment [4] - Two bridge collapses in the border area between Russia and Ukraine classified as terrorist attacks by Russian investigative committee [4] - Ukraine claims its "spider web" operation caused $7 billion in losses to Russia, which Russian media dismisses as rumors [4] - New drone attacks by Ukraine on Kursk, Russia, led to residential fires [4] - An explosion occurred on the railway section in Bryansk region, but no casualties or damage to the train were reported [4] Negotiation Situation - No specific agreement for a meeting between Putin and Trump has been established, according to a Russian presidential assistant [5] - The second round of negotiations between Russia and Ukraine is imminent, with Zelensky presenting three core demands [5] - Documents indicate Ukraine will propose a roadmap for lasting peace during negotiations in Istanbul [5] - The Russian delegation has arrived in Turkey for the second round of negotiations [5] - Russian Foreign Minister and U.S. Secretary of State discussed the upcoming Russia-Ukraine negotiations over the phone [5] - Turkish presidential office announced that both parties will engage in direct negotiations in Istanbul on June 2, starting at 1 PM local time [5] - Russian sources report that a memorandum on peace agreement has been received from Ukraine [5]