This is what they wanted.
And it's working wonders now - the US will make a fortune off of LNG and arms sales, whilst completely destroying competing European industry which suffers gas shortages and uncompetitive energy prices.
It's a masterful long-term play.
Nobody can foresee the future. US supported Yeltsin because that was something that made sense in a given time for them. They didn't do this because they expected to make ton of money in 2022 of LNG and arms sales.
Now they were given opportunity to make some $ which also coincidence with their own interests.
But they are not able to tell what impact will this have in another 20-30 years. They do it because it makes the most sense now. Not because they have this super masterful long term play.
Someone to point to and keep the military and intelligence agency funding flooding in.