整理：俄乌冲突最新24小时局势跟踪（6月20日）

Conflict Situation - Russian Defense Ministry reports that Russian troops have occupied Novomykolaivka in the Donetsk region of Ukraine [2] - New round of prisoner exchange between Russia and Ukraine reported by the International News Agency [2] - Putin states that only 47% of the required military strength remains for the Ukrainian army, indicating that a force below 50% is ineffective [2] Negotiation Situation - Zelensky expresses readiness for high-level meetings and willingness to meet with Putin [3] - Kremlin indicates that humanitarian exchanges and responses to memorandums will be topics for the third round of negotiations with Ukraine [3] - Russian Foreign Ministry spokesperson Zakharova announces that the Russian delegation will prepare to arrive in Istanbul after June 22 to continue negotiations [3] - Kremlin spokesperson Peskov states that the date for the third round of negotiations with Ukraine will be determined next week [3] Other Situations - Russian Foreign Ministry expresses intent to withdraw from military-technical cooperation agreements with Germany [4] - Zelensky appoints Henadiy Shapovalov as the new army commander, replacing the commander who resigned due to Russian attacks on training areas [4] - Ukrainian Foreign Minister announces an emergency meeting of the UN Security Council on June 20 due to large-scale shelling, calling for increased pressure on Russia, including air defense assistance [4] - International Atomic Energy Agency states that the team at the Zaporizhzhia nuclear power plant has been informed that issues regarding cooling water supply and off-site power must be fully resolved before any reactor can be restarted [4]