VIENTIANE, Laos — China scored an unequivocal diplomatic victory Monday, preventing Southeast Asia’s main grouping from criticizing it for territorially expanding in the South China Sea, even though some of the bloc’s members are victims of Beijing’s actions.

After hectic negotiations, the 10 members of the Association of Southeast Asian Nations issued a watered-down rebuke that amounted to less than a slap on the wrist, and exposed the deep divisions in a regional body that prides itself on unity.

In a joint communique released after their talks, the foreign ministers of ASEAN said only that they “remain seriously concerned over recent and ongoing developments” in the South China Sea. The statement did not mention China by name in referring to the developments.