A senior U.S. diplomat says Vietnam should improve its human rights record in order to make progress in its relationship with the United States.
Assistant Secretary of State Kurt Campbell says Vietnam's stance on human rights is "antithetical" to otherwise warming economic and military ties between the two countries.
Campbell, the top U.S. diplomat for East Asia, spoke to reporters Thursday in Hanoi.
He declined to mention specific cases, but said Vietnam still holds political prisoners.
Rights groups regularly accuse Vietnam of human rights violations.
In January, the U.S. Embassy urged Vietnam to release Bui Thi Minh Hang, an activist who in November was sent without trial to a drug rehabilitation camp for two years.