What we are seeing is nothing more than the "nationalism" of vaccines in a global crisis where we have arrived at the point where every leading nation is focused on "me first" in a situation with a scarcity of vaccines. I expect we will see more with countries seizing doses of vaccines in transshipment -- just like we say earlier with ventilators and PPE. Contracts be damned - everyone for themselves.
There is also news this past week about Indian government officials threatening not to provide vaccine raw materials and doses to other countries unless more doses are distributed within India. This, of course, would impact global supply chains and hurt India's "vaccine diplomacy" efforts. And this is a situation where the country is actually meeting its internal distribution targets but is uneven across regions (especially those areas where politicians demanding "India first" are from).