A generation ago, from mid-1995 into early 1996, China lobbed missiles in the waters around Taiwan as the self-governing island prepared to hold its first fully democratic presidential election. Washington forcefully intervened to support its ally, sending two aircraft carrier battle groups to patrol nearby. The carriers, then as now the spearhead of American power, intimidated Beijing. The vote went ahead. The missiles stopped.

Today, with tension again running high, Washington still backs Taiwan. Chinese President Xi Jinping on Jan. 2 renewed Beijing's long-standing threat to use force if necessary to restore mainland control over the island. But the United States is now sending much more muted signals of support.

On Sunday, American ships sailed through the Taiwan Strait. This was the seventh passage of U.S. warships through the narrow, strategically sensitive waterway since July. Each time, though, just two U.S. vessels have ventured through; this week, it was a pair of destroyers. No powerful flotillas and certainly no aircraft carriers. It has been more than 11 years since an American carrier traversed the Taiwan Strait.