The US has made irresponsible remarks over the maritime issues in recent days, which have encouraged some countries' provocative activities, Chinese Foreign Ministry Spokesperson Hua Chunying told a media briefing here today.
She called on the US to speak and act cautiously, stop making irresponsible remarks, and do more to safeguard regional peace and stability.
She was reacting to US State Department spokeswoman Jen Psaki's remarks that Washington was opposed to provocative or unilateral actions that jeopardise peace and security in the South China Sea.
China faced heightened tensions with Vietnam over its attempts to drill for oil in the disputed waters.
Also, China warned that it reserves the right to take further action if the Philippines failed to release its 11 fishermen detained for fishing near islands claimed by Manila.
Hua also criticised Japanese Foreign Minister Fumio Kishida's comments that Japan regards China's drilling operations in South China Sea waters as "provocative" to regional security, and Beijing should clarify to Vietnam and the international community the basis of its increasing maritime activities.
Hua said Japan's aim is to take advantage of China's troubled situation and it cannot hide its true intention of undermining peace and stability by stirring up unilateral provocations in the waters off China's Diaoyu Islands.
"We require the Japanese side to stop any provocative words and actions," she said.