TAIPEI, Taiwan — Chinese and Philippine coast guard ships collided at sea, damaging at least two boats, in an encounter early Monday near a new flashpoint in their increasingly alarming confrontations in the disputed South China Sea.

Both blamed the other for the collision near Sabina Shoal, a disputed atoll in the Spratly Islands, where overlapping claims are also made by Vietnam and Taiwan. There were no reports of injuries.

China’s coast guard accused the Philippines of deliberately…