The weakening dollar is bad for Russia.
When the rubble got inflated, Putin just shrugged and said, well we get more money when we export stuff. The trade is in USD and if the rubble gets weaker then for every USD enters Russia they get more rubble.
But if the USD gets weaker than it means they are lowering the difference, essentially it's like as if the rubble gets stronger.
So inflating the USD is a counter Russia move as well among others, to target Russian economy.