US Secretary of State John Kerry on Wednesday called for Thai junta to lift restriction on political activities and speech.
The junta should restore civilian rule and return quickly to democracy through free and fair election.
"In Thailand, a close friend and ally, we are disturbed by the setback to democracy and hope it is a temporary bump in the road," Kerry said.
The top US diplomat spoke during a stop in Hawaii that concluded a global tour through Afghanistan, Australia, Myanmar and Solomon Islands as part of the US administration's "rebalance" to Asia.
Commenting on democracy and human rights in Asia, Kerry acknowledged "bright spots," but also pointed to "backsliding" in places such as Thailand, where the army seized power in May.