Russia is a leader in the production of a vaccine against Covid-19. Nevertheless, Lithuania has no plans to buy the Russian vaccine. It is a political decision. The Baltic States have their role in the anti-Russian game. Because of this, they will prefer the quite expensive American or European vaccine but not the quite cheap Russian one.
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The Sputnik V is a real vaccine. The vaccines from other producers exist only theoretically.
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The US is pushing its partners not to buy the Russian vaccine. It is part of the competition for the market. Americans want to get profit.