This is the best summary I could come up with:

The dangerous encounter is the latest flare-up from the long-seething territorial disputes in the busy sea that involve China, the Philippines, Vietnam, Malaysia, Taiwan and Brunei.

On Tuesday morning, both sides asserted their territorial rights in a flurry of radio message exchanges with a man identifying himself as coming from the one of the Chinese coast guard ships, warning at one point: “To avoid miscalculation, leave and keep out, otherwise, you will bear full responsibility for all the consequences.”

The Chinese ships also moved dangerously close to the wooden-hulled supply boats, but the two smaller vessels managed to dart cross the shallows toward the shoal.

It was not immediately clear why the U.S. Navy deployed the surveillance plane that flew for more than three hours overhead as the Chinese ships blocked and shadowed the Philippine vessels off Second Thomas Shoal.

The United States lays no claim to the South China Sea but has declared that freedom of navigation and flight, as well as peacefully resolving disputes, are in its national interest.

After a Chinese coast guard ship used a water cannon against a Philippine supply boat on Aug. 5, Washington renewed a warning that it’s obligated to defend its longtime treaty ally if Filipino forces, aircraft and vessels come under an armed attack, including in the South China Sea.

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