Problems with Water - FONOPS, UNCLOS and Global Commons

Is the United States violating international law of the sea by using FONOPs and are other powers like China following it?

Countries such as Brunei, Indonesia, Malaysia, the Philippines, Taiwan and Vietnam have been outraged by China’s growing intrusion into the South China Sea and widespread claims of sovereignty.) Now it is claimed sovereignty. The United States (US), in response, is tightening its sacred and military presence in the region and engaging in a growing number of exercise navigation freedom (FONOPs).