Vietnam paid back in same terms what China did to Vietnam. The country issued stapled visas with for Chinese for passport holders on separate paper, to counter China’s map on its new e-passports showing disputed areas as part of its territory. Previously, China had issued passports with maps displaying islands in the South China Sea as part of Chinese territory.
Recently China issued passports with map showing Arunachal Pradesh and Aksai Chin as part of China for which the two countries are holding periodic talks to resolve the border dispute.
In reply to this, Indian Embassy started stamping the Chinese passports with official map of India.