It's tit for tat.
For the Russian side, it is a diplomatic retaliation for an American law that the Russians see as a sanctionising against Russian officials that are claimed by the US to have commited human rights violations. The socalled Magnitsky Act is poisening bilateral relations since longer time now. The law is internationally disputed indeed.
I don't comment. I just explain the background. A has pushed B. Now B pushes A back.
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