I can think of at least a dozen reasons but I'll give you one: We are in delicate peace negotiations with Russia _right_ now. There is good reason to isolate all foreign policy decisions with that country to those negotiations. It is called doing more than one thing at a time.
We are also in delicate peace negotiations with Ukraine right now, but we still put import taxes on them. If you think that the administration would put more import taxes on Russia after the negotiations are done, then at least you're consistent. I need your other 11+ reasons to be convinced.
If we were in delicate peace negotiations then we should put more pressure on them. Tell them extra tarrifs will be removed if they agree. The main reason there is still war is Putins stubbornness in admitting he started an unwinnable war. More pressure is helpful
> U.S. total goods trade with Russia were an estimated $3.5 billion in 2024.
Among European Union members:
> The total bilateral trade in goods reached €851 billion in 2023.