It is not as much the US remaining antagonistic towards Russia, as it is Russia being antagonistic towards the West and the West having to respond appropriately. Listen to the internal Russian public media, 90% of the narrative on the international situation is how the evil West led by the US is plotting, trying to take away Russian resources, to destabilize Russia, etc. Pretty hard to be friends with someone who hates you to the point of near-zealotry.
In 90-s, the relations were somewhat warm, because the Russian government was taking a break from the usual "We are surrounded by enemies, we need a strong leader to defend us from them!" attitude. Now, it is back to the gutter. Especially with Trump starting to employ a similar narrative...