This is off topic for this thread, so I will just provide something for you to think.Russia is playing a game. If Putin manage to extract a promise from Biden that the US and NATO will respect Russia’s primacy in the former Czarist sphere of influence, Russia will immediately drop collaboration with China in any field that makes the US nervous.
The main question is whether the US can admit to herself that she has been overplaying her hand with respect to Russia during the last 20 years, and her capacity to simultaneously contain both russian and china is weak.
Russia and Putin sees this, and wants to leverage the fact that in the long run Russia’s capacity to reduce American global influence is much less than those of the chinese. So it wants something from the US for not taking China’s side.
Why give up something if one can have both? On the other hand if Russia can only get one or the other, why do you think US can offer any better than China? The supposed "Czarist sphere" is only eastern Europe, it is a peanut compared with the possible gain from the whole world by partnering with China. What the US could have offered to Russia might be just like the 80 vials of vaccine to Trinidad and Tobago of 1.4 million people.