Some other countries have started vaccinating their citizens or donating jabs earmarked for them.
The foreign ministry in its admonition says that issues such as sexual orientation 'are choices for only Singaporeans to debate and decide'.
Before departing, the North's most senior diplomat in Malaysia accused Malaysia of siding with Washington in a 'conspiracy' against Pyongyang, and committing a 'large hostile act'.
The foreign ministry says Mun Chol Myong's extradition was only carried out after the due legal process had been exhausted, and in accordance with the principles of justice and rule of law.
It is understood that at least three former ministers have been silently campaigning for diplomatic jobs.