Because it is not an essential product that has to be shipped to another country during a pandemic.
They have more important items they need to ship.
Thanks for the reply, but I could have done without the snark and incorrect information.
Amazon.com is most definitely shipping BluRay/DVD/4K discs internationally, although you can expect significant delays because they're prioritising essential items and couriers are extremely busy.
This may be more of a rights distribution issue.
So apparently Paramount did it again. People elsewhere are up in arms over the fact that the wrong cellphone is on the cover of the steelbook. They're saying this model of cellphone didn't exist at the time. It's Top Gun all over again!