美国国务卿鲁比奥：叙利亚局势复杂。

Core Viewpoint - The situation in Syria is complex, as stated by U.S. Secretary of State Rubio [1] Group 1 - The U.S. government is closely monitoring the developments in Syria [1] - There are multiple factors contributing to the complexity of the Syrian situation, including geopolitical interests and humanitarian concerns [1]