Are you sure? In 2024, exports of Russian goods to the US totaled $3.27bn, and the US exported $526m worth of goods to Russia. Not a ton, but more than many countries that received tariffs. Or what definition of zero trade are you using?
> US is still sanctioning Russia, meaning there's zero trade between US and Russia. It's illegal for US people and companies to buy from Russia.
Quoting the Trump administration:
U.S. goods exports to Russia in 2024 were $526.1 million, down 12.3 percent ($73.5 million) from 2023. U.S. goods imports from Russia totaled $3.0 billion in 2024, down 34.2 percent ($1.6 billion) from 2023. [0]
If the same formula were applied to Russia as every other country in the world, the Russian tariff would be above 40% since it's half of (3500-500)/3000 = 85.7%
That's why there are no tariffs on Russia: there's no trade, there's nothing to tariff.
I don't see how you concluded that US is currently "in service of Russia".