美媒：美乌就安全保障议题取得进展

Group 1 - The core viewpoint of the articles indicates that the United States and Ukraine have made progress in negotiations regarding security guarantees, but there are still disagreements on territorial issues [1][2] - The US and Ukraine are close to reaching a security guarantee agreement similar to NATO's Article 5 collective defense clause, with 90% of the topics reportedly agreed upon [1] - The territorial issue remains a significant challenge that will ultimately need to be resolved through negotiations between Ukraine and Russia [1] Group 2 - Ukrainian President Zelensky stated that joining NATO is the true guarantee for Ukraine, but due to opposition from the US and some European partners, Ukraine is willing to accept security guarantees similar to NATO's collective defense [2] - Recent talks in Berlin lasted over five hours, involving discussions on a "peace plan" and economic agenda, with both sides reporting substantial progress [2] - The head of the Ukrainian negotiating delegation noted that tangible progress has been made in the US-Ukraine talks over the past two days [2]