China and the U.S. Risk Accidental War Over Taiwan

When 18 Chinese warplanes breached Taiwan's air defense identification zone last month, it was a further sign of rising tensions across the Taiwan Strait.

The latest in a series of large-scale military exercises aimed at intimidating Taiwan, official Chinese media warned the self-governing island's leaders -- and the U.S., which has stepped up its military and diplomatic support for Taipei -- of dire consequences if unspecified Chinese red lines are crossed.