Taiwan is battling a spike in domestic infections and has vaccinated only about 3 percent of its population. Japan has agreed to procure more than 300 million doses of coronavirus vaccines from Pfizer Inc, Moderna Inc and AstraZeneca, more than enough to cover its entire population.

"At the time of the great east Japan earthquake 10 years ago, people in Taiwan sent us a lot of donations quickly. I believe that is etched vividly in the minds of Japanese people," Foreign Minister Toshimitsu Motegi said, announcing the vaccine donation. "Such an important partnership and friendship with Taiwan is reflected in this offer."

The vaccines landed at Taipei's main international airport early in the afternoon. Taiwan Health Minister Chen Shih-chung said he was "extremely thankful" the shots had arrived at a tense moment in the island's fight against the pandemic, as he reported another 472 new infections.

"I believe it will be very helpful in overall pandemic prevention," he added.

The donation is a triumph for Taiwan President Tsai Ing-wen, who has faced public anger about the slow arrival of vaccines and small protests by the main opposition party, the Kuomintang, outside her offices.

In a live online broadcast from her office, Tsai called on people to understand that it was not only Taiwan facing challenges getting vaccines now, with global supplies tight.

"Taiwan's international situation is very difficult. Even before vaccines are loaded onto the aircraft, there may be variables."

China, which claims the island as its own territory, has offered vaccines, but Taiwan has repeatedly expressed concern about their safety and accused China of trying to block Taiwan's vaccine purchases internationally.

Chinese Foreign Ministry spokesman Wang Wenbin told reporters in Beijing that despite China's goodwill offer of shots, Taiwan had "lied that the mainland obstructed the provision of vaccines" to the island.

"The Taiwan authorities for their own selfish political gains have engaged in political manipulation on vaccine issues," he added.

Though Taiwan's share has not been announced, the island will also get shots under a White House plan for the United States to share 25 million surplus COVID-19 vaccine doses with the world.

Taiwan has received only about 860,000 doses so far, mainly AstraZeneca shots, but also a smaller number from Moderna. It has ordered more than 20 million doses from AstraZeneca and Moderna and is also developing its own vaccines.

In an emailed statement to Reuters, Johnson & Johnson said that it had been in "confidential discussions" with Taiwan about providing its COVID-19 vaccine to the island since last year, but gave no details.

The J&J vaccine requires a single dose, rather than the two-shot regimen of most other COVID-19 vaccines.

Japan approved AstraZeneca's vaccine last month and has contracted to buy 120 million doses. But there are no immediate plans to use the shots, amid lingering concerns raised internationally over blood clots.

Meanwhile, Malaysian health authorities said on Friday conditional approval had been granted for AstraZeneca's COVID-19 vaccine manufactured by Siam Bioscience Co in Thailand.

Health Ministry director-general, Noor Hisham Abdullah, said in a statement the vaccine supply received from Thailand is expected to speed up implementation of Malaysia's national vaccination program.

The government had previously put the AstraZeneca vaccine in a parallel optional program after reports of possible links to very rare blood clots.

But the vaccine was brought back into the national immunization program last week after hundreds of thousands of people scrambled to get the shot.

Malaysia has purchased 12.8 million doses of AstraZeneca's vaccine, half through the COVAX facility and the remainder directly from the drugmaker.

The first shipment of 610,000 doses from Thailand is scheduled for this month, followed by 410,000 doses in July and 1.2 million doses between August and September, the government had said previously.