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Of course. Why wouldn't US do this to Russia. Because they know that next day Russians will wave a tiny vial on TV saying they've cured it. And retaliate beyond repair.
Why not Iran? They have nothing to gain. But an economic 'war' with China. One has to make them look ugly and not appealing to deal with.
Same story is with so many African nations.

As a matter of fact, the italian man who was diagnosted with coronavirus walked out of a swiss hospital already. Cured. LOL.