If there is a country that benefited most from this virus, it's Russia. Crippling economies of China and especially US (with additional misinformation to make people not wear masks).

Why would a country that wanted to deploy a bio weapon started on it's own land? It's not like travel to other countries was restricted.

Also Russia is not a country that would have qualms about affecting own citizens. Putin get to power by coordinating bombings on apartment complexes and blaming Chechens for it.