
They rallied in front of both embassies on Friday and submitted petitions to the leaders through representatives of the embassies.
The protesters waved banners and posters, written in English, criticising Prime Minister Abhisit Vejjajiva, his government and Foreign Minister Kasit Piromya.
Thailand will host Asean Summit in Hua Hin next month. It had rescheduled the summit several times due to street protests.
Veera Musikapong, Jakrapob Penkair and Nuttavudh Saikue, who were hosts of controversial Truth Today TV programme, a pro-Thaksin Shinawatra media outlet, were among leaders of the protesters.
Reading the petition, Jakrapob said that Abhisit Government was not real representatives of Thai people. Moreover the appointment of Kasit had against the public's views as he joined the protesters after they seized the airports.
"We support Asean, but could not support the (Thai) government that had no legitimacy to administer the country," he said.
A Burmese diplomat received the petition from Jakrapob.
Later the red shirt protesters marched to Singapore Embassy on Sathorn Road and submitted the petition to the embassy's first secretary, who said that Singapore could not get involved in the matter because it was internal issue.
However he will forward the petition to Singapore government.