HANOI — Vietnam has curbed the violent anti-China protests that swept the country after a Chinese oil rig began drilling in contested waters. But authorities have not dropped their opposition to the Chinese operation, sending boats to harass the drilling, considering waging a legal case in international courts to resolve the dispute, and courting regional allies like the Philippines.

China tightened the screws on Vietnam this week by sending a “position paper” to the United Nations on the operations of its $1 billion-oil rig in a part of the South China Sea that Vietnam also claims.

It accused Vietnam of ramming its vessels, sending frogmen and “other underwater agents” in waters which it says are indisputably Chinese.

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