国际时政周评：地缘博弈持续

Group 1: Geopolitical Developments - Progress in US-Ukraine talks may lead to a security assurance agreement, with Ukraine potentially promising not to join NATO in exchange for a collective defense framework similar to Article 5 of the NATO treaty[2] - Trump's administration has ordered a complete blockade on sanctioned oil tankers entering or leaving Venezuela, causing fluctuations in international oil prices, with Brent crude oil rising by 3% on December 17 and decreasing by 1.8% over the week[12] - The US Congress has passed the 2026 National Defense Authorization Act, increasing military spending to a record $901 billion, which is $8 billion more than the Trump administration's request[16] Group 2: Future Focus Areas - Continued attention on US-China trade relations, particularly regarding tariffs and strategic industries, including semiconductors and critical minerals[22] - Ongoing geopolitical tensions in the Middle East, with a focus on the potential for renewed conflict in Gaza and the status of Iran nuclear negotiations[18] - The US government's strategy aims to strengthen control over the Western Hemisphere, with a focus on countering leftist governments in Latin America and securing energy resources[14]