Thailand's Prime Minister Prayuth Chan-o-cha was fined 6,000 baht ($190) on Monday for not wearing a face mask during a meeting at his office.
The fine was directly collected by Bangkok Governor Aswin Kwanmuang, accompanied by the city's police chief, after a photo showing the maskless premier chairing the meeting on vaccine procurement went viral on the internet, sparking public criticism.
Aswin said that Prayuth had earlier in the day inquired with city hall on whether he had violated regulations and agreed to be fined.
In Bangkok, due to the spread of coronavirus infections, citizens are now obligated to wear masks when going outside, and authorities have begun imposing fines of up to 20,000 baht on offenders.
Some commercial facilities and entertainment facilities have been closed from Monday.
The number of newly infected people in Thailand reached a record daily high of 2,839 on Saturday.
Earlier this month, Norway's prime minister, Erna Solberg, was reportedly fined 20,000 kroner ($2,410) after breaking coronavirus social-distancing rules by holding a birthday celebration despite a government ban on gatherings of more than 10 people.