Taiwan is on high alert in response to China’s unannounced deployment of naval and Coast Guard ships, as tensions rise over U.S. support for the island.

A violent attack on a Vietnamese fishing boat tests Hanoi’s muted but resolute approach to China’s aggression in the South China Sea.

A meeting between the two leaders comes just two days after they settled a tense border dispute in the Himalayas. But experts said their long-term geopolitical rivalry would persist.

Four years ago, several soldiers from both sides were killed in a bloody melee. Any thaw between the countries could have global implications.

The drills were the latest show of force by China, which claims Taiwan as its territory and has protested Western support for the island.

Pentagon officials discuss whether the flow of assistance could be hurting the military’s ability to respond to a new conflict.

Scores of Chinese aircraft and dozens of ships surrounded Taiwan, after President Lai Ching-te rejected Beijing’s claim over the island.