About bloody time, I suppose Biden has stopped listening that self-deterring coward Jake Sullivan.
I suspect more that now that this move is tied to the election being over - all domestic constraints are done. In fact the Trump victory might have influenced the decision: it potentially creates more complications for him, while at the same time Russia does not want to antagonize a new administration until it is blatantly hostile. Biden can leave this little policy nugget for Trump to deal with, and Putin has to be careful not to set a bad tone with a new president that might potentially benefit him.