就俄乌问题，特朗普突然“改变立场”

Group 1 - The core viewpoint of the article is that former President Trump believes Ukraine has the potential to "regain all of Ukraine and restore the original borders" with the support of the EU and NATO [2] - Trump stated that the ongoing conflict, lasting over three and a half years, has created economic difficulties for Russia, suggesting that with EU financial support and NATO military backing, returning to the original borders is a feasible option [2] - Following a meeting with Ukrainian President Zelensky during the UN General Assembly, Trump expressed support for NATO allies, indicating that NATO countries should take action against Russian aircraft entering their airspace, depending on specific circumstances [2] Group 2 - The article notes that Trump's recent statements reflect a shift in his stance, which analysts attribute to the stagnation of Russia-Ukraine negotiations after the Alaska summit on August 15 [2] - NATO has initiated the "Eastern Sentinel" military operation to strengthen defense and deterrence along its eastern flank, in response to recent claims by Poland and Estonia regarding Russian incursions into their airspace [2]