I received an official answer from EA support that High Seas Booster for Ultima Online is not available for Russian players and it is not planned to be available.
This is a great disappointment for Russian Ultima Online players (the few of them who remained) for two reasons. First, we, unlike other civilized nations, will not have legitimate access to nice fishing content. Second, it is clearly unfair, because earlier it was possible to buy it through UO Accounts store.
This raises a topical question: do (and should) virtual worlds users have any fair rights to access content, or we are just poor deprived beings who are totally dependent on service providers?
The legal aspect of this issue may imply the question whether constitutional rights securing access to cultural heritage/objects may be extrapolated on modern virtual environments.