Vietnamese authorities have refused to stamp new Chinese passports bearing a map that lays claim to disputed areas in the South China Sea.
Border authorities have instead been issuing visas on separate pieces of paper and stamping those issued previously as invalid.
Vietnam, the Philippines and Taiwan have objected to the map because it shows disputed islands in the South China Sea to be a part of China.
India is also embroiled a row over the map's inclusion of disputed areas, the BBC reports.
India, which disputes two Himalayan regions also claimed by China that is included on the map, is stamping its own map on visas it issues to Chinese citizens.
Vietnam, the Philippines, and Taiwan have already complained to China about the map on the new passport, which they say is an infringement of their sovereignty.
Meanwhile, China's Communist party newspaper, The People's Daily, said that Vietnam and other neighbours were trying to contain China with help from the United States. (ANI)