Wang said in a statement posted Wednesday on the Chinese foreign ministry's website that the move by the three countries came at an inappropriate time and wasn't constructive.
"Now it is the time to test whether you are peacekeepers or troublemakers," said Wang, referring to the three countries, the Associated Press reported.
The trilateral statement had urged China not to construct military outposts and reclaim land in the disputed waters, making a strong show of support for Southeast Asian nations that have territorial disputes with Beijing in the area.