Washington:  The clusters of Chinese vessels busily dredge white sand and pump it onto partly submerged coral, aptly named Mischief Reef, transforming it into an island.

Over a matter of weeks, satellite photographs show the island growing bigger, its few shacks on stilts replaced by buildings. What appears to be an amphibious warship, capable of holding 500 to 800 troops, patrols the reef’s southern opening.