I would have agreed with you before seeing the pathetic performance Russia has displayed during this invasion. Without nukes I think the US dusts Russia easily in conventional warfare.
We are capable of wrecking Russia in a conventional war. But I have my doubts about the American will to do so.
We got skittish over the blood price necessary to win in Afghanistan. In Iraq. In Vietnam. Each of those is child's play compared to Russia.
Russia is historically a very unwelcoming country for invaders. They may be indifferent to invading Ukraine...but that may change very quickly with a foreign invader. In the past, the Bear has been willing to bleed. The US has showed the willingness to bleed the way Old World countries have.....literally zero times.
I love dunking on Europe for being soft. But historically....when they get themselves worked up, they tolerate death at levels Americans have never demonstrated a will to match.
End of the day, doesn't matter. We aren't going to war with Russia because they aren't a conventionally armed enemy. They got the bomb.