From The Washington Post (link):
Think of next week’s meeting between President Bush and China’s President Hu Jintao as a summit of the planet’s most voracious energy user and the planet’s fastest-growing energy user. In a world of limited oil resources, that could strain U.S.-China relations as much as any issue.
China’s oil industry has wooed countries that the United States has tried to isolate for political reasons — such as Sudan, Iran and Burma — potentially undermining the isolation efforts. Three of China’s major oil companies have been aggressively pursuing long-term supply arrangements in such places as Venezuela, Nigeria, Gabon and Angola.