Obvious answer is that the USA is the world’s largest economy while Russia is not, so if USA says “if you trade with Russia then you can’t trade with me” then most countries will happily accept ceasing trade with Russia to remain in the US market but if Russia says the same about the USA then people would just laugh and go trade with the USA.

The only country that might have some leverage in sanctioning the US is China but China has historically had a “no allies” policy. Chinese leadership hate the idea of that because then they would feel obligated to defend them and defending another country is viewed very poorly in Chinese politics. They thus only ever form trade relations and never alliances, meaning if your country is attacked they have no obligation to you. Chinese politicians may verbally condemn the attack but they won’t do anything like sanctions or even provide their own military support in return.