TAIPEI, TAIWAN —
China sent a survey vessel through waters claimed by its maritime sovereignty rival Vietnam this month to warn Hanoi against starting new energy exploration projects and filing any motions in an international court, observers say.

Tracking tools showed China’s 105-meter-long, 58-person survey ship Haiyang Dizhi 4 moving toward Vietnamese waters on June 14, Radio Free Asia reported. The vessel passed three days later within 200 nautical miles (370 kilometers) of Vietnam’s coast – a country’s normal exclusive economic zone – the report said.

That movement follows the passage of another Chinese vessel near Vietnam in April and a standoff at sea last year.

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