Prime Minister Hun Sen said easing the entry requirements for international travellers would attract investment, business and tourism to the kingdom.

"It will also reduce nose pain from taking the Covid-19 test," he said. "Undergoing a Covid-19 test is costly as it requires test kits and personal protective equipment."

However, all inbound passengers must still present a full Covid-19 vaccination certificate upon arrival. If not, then travellers must get vaccinated within 14 days at a location designated by the Ministry of Health.

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"We know that we have a limited budget for the fourth dose, but the government may reduce other expenses to buy the vaccine. The government will not [go] bankrupt at any cost," he said.

The government's budget was limited but support from the Asian Development Bank and the Asian Infrastructure Investment Bank would help fund the inoculations, he added.

Hun Sen questioned Australia's commitment to delivering two million doses of the Pfizer vaccine as promised earlier this year.

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