After the sinking of the South Korean navy warship Cheonan in March 2010 and the shelling of Yeonpyeong Island in November, China adopted a series of diplomatic actions to safeguard the stability of the Korean Peninsula. However, serious diplomatic conflicts occurred between China and South Korea over how to respond post-Cheonan. South Korea thought that the incident was a watershed in the development of China-ROK relations and launched a re-evaluation of its policy toward China. The Lee Myung-bak government accepted part of the results of the re-evaluation and partially adjusted its policy, but did not change its understanding of China fundamentally.