特朗普改口称“不确定能否结束俄乌冲突”，美媒：与他的竞选承诺形成鲜明对比

Group 1 - Trump's recent statement on the Russia-Ukraine conflict indicates uncertainty about his ability to resolve it, contrasting with his previous campaign promise to end the conflict quickly [1][3] - Trump expressed a desire for a ceasefire, stating it remains a priority, but later downplayed his previous commitment to resolve the conflict on his first day in office as an exaggeration [3] - The Kremlin reported that President Putin and Trump had a lengthy discussion about the situation in Iran and the Middle East, emphasizing the need for political and diplomatic solutions to disputes [3] Group 2 - Ukrainian President Zelensky mentioned a productive call with Trump, agreeing to work together to enhance Ukraine's air defense capabilities [3] - The Pentagon has paused some arms shipments to Ukraine due to concerns over U.S. military ammunition stockpiles, but Trump denied any reduction in support, claiming the U.S. is still providing weapons and collaborating with Ukraine [3]