OK; BRICS may be one reason for the tariffs. I know Trump's bad history and I think that he hates Zelenskyi because the earlier blackmailing episode. But on the other hand Ukraine gets arms from USA now and I think that's the main thing at the moment. That situation could be much worse.
With an extra 10% put on the price of the arms, also don't forget the restrictions that has been put on their use. Trump has not put any sanctions on Russia. He has on Ukraine, and what about the sanctions he was putting on China for buying Russian oil, I judge Trump by his actions, not words.
I know all that and I don't like Trump at all which You may have noticed if You have read my earlier comments about him. All I'm saying that situation could be much, much worse than it is now.