Well, Reuters reported (via Malay Mail):
Japan is drawing on 120 million doses of the AstraZeneca vaccine it has reserved, as it has no immediate plans to use the shots at home amid lingering concern over international reports of blood clots.
Then, Reuters also reported:
A Taipei-based official familiar with Japan’s two vaccine donations said while the Japanese government has been subtle in its offers, mainly focusing on Taiwan’s urgent medical need, there was a broader message.
The donations are actually an important move to echo the US campaign of a free and open Indo-Pacific region to counter China’s geopolitical clout in the region, the person said, speaking on condition of anonymity as they were not authorised to speak to the media.
Hmmm, coincidentally, Taiwan and Vietnam aren't exactly pally buddy with China and indeed, coincidentally again, both like Japan encircle China too, wakakaka - nice forward locations for the US military or the US nefarious schemes.
Yes sirree, there ain't no free bento-box.