The updated U.S. travel advisory comes amid concerns over an escalation of a long-standing dispute between the two Southeast Asian neighbors who share a 500-mile land border—largely mapped by France when it ruled Cambodia for 90 years until 1953.

SEOUL, July 27 (Yonhap) -- South Korea on Sunday raised the travel alert for border regions in Cambodia and Thailand, the second adjustment of travel warning in three days, as the tensions from the two countries' armed conflict are escalating.

Australian travellers have been warned to exercise a “high degree of caution” in Thailand “due to security and safety risks” amid an escalating border conflict with Cambodia that has left at least 33 people dead.

India issues travel advisory for nationals in Cambodia as border clashes with Thailand escalate; UNSC holds emergency meeting.