整理：俄乌冲突最新24小时局势跟踪（4月27日）

Conflict Situation - A Russian drone attack targeted a nine-story residential building in Dnipro, Ukraine, resulting in 1 death and at least 3 injuries, including a child [1] - A Russian military helicopter crossed into Polish airspace, indicating Russia is testing Poland's air defense readiness [1] Negotiation Status - Russian President Putin confirmed readiness to negotiate with Ukraine without preconditions during a meeting with U.S. envoy Vitkov [2] Military Developments - Ukraine reported that Russia lost 1,110 soldiers in the past 24 hours [3] - Russia's Chief of General Staff claimed full recovery of the Kursk region, which Ukraine disputes [3] - Ukrainian forces continue operations within Russia's Belgorod region [3] - Russian military launched 414 attacks in the Zaporizhzhia region overnight [3] Diplomatic Engagements - Ukraine is finalizing a mineral agreement with the U.S., but more time is needed [3] - President Zelensky emphasized achieving a comprehensive and unconditional ceasefire during a meeting with Trump [3] - Russian Foreign Minister stated that Russia will not disclose negotiation progress until U.S.-Russia talks on Ukraine conclude [3] - President Zelensky is scheduled to meet with European Commission President Ursula von der Leyen [3] - President Zelensky held a meeting with French President Macron [3]