Singapore’s Ministry of Foreign Affairs on Wednesday updated its travel advisory to recommend against all non-essential travel to North Korea, a bulletin posted showed.

The change in status is notable because the countries have long enjoyed warm relations; Singapore until last year offered North Koreans rare visa-free access, while Pyongyang does not charge Singaporeans for visas to visit the North.

“Given recent developments and the unpredictable situation arising from the actions of the Democratic People’s Republic of Korea, Singaporeans should avoid all non-essential travel to North Korea,” a bulletin posted on the foreign ministry website said.

It added that Singapore