I personally think Trump loves Russia and Putin and generally wants to do business with them. He has wanted a Trump Tower in Moscow for decades and probably still wants that to happen.
Wants to be bribed by them. But to him, bribe = business, I guess.
The reason US sanctions Russia is because the US has been pushing its oil insustry in Europe. For instance, EU tariff deals included buying a minimum amount of hydrocarbon products:
> As part of this effort, the European Union intends to procure US liquified natural gas, oil, and nuclear energy products with an expected offtake valued at $750 billion through 2028.
In that context, US sanctions on Russia serve a purpose which isn't solely helping Ukraine ; I don't see the US lifting these sanctions anytime soon.