[arunabha]

One piece of evidence would be that Russia, Belarus and North Korea have been specifically excluded from US tariffs. You could argue that the net effect is negligible since we don't import a lot from those countries, but the signal being sent to long term allies is devastating to America's future relations with them.

[tstrimple]

Uninhabited islands made the tariff list, but those countries somehow managed to slip through.

[oldprogrammer2]

The US has trade sanctions with those countries.

[faster]

The US has trade sanctions on Iran too, and Iran is on the tariff list. I don't think that's it. Some transparency would be helpful.

[oldprogrammer2]

Iran is on the tariffs list because of Trump's maximum pressure policy (an official National Security Memorandum) against Iran. This is coupled with Trump's willingness to get Russia to cooperate in the ceasefire.

I'm not claiming his administration's logic is 100% sound, only that there is an explanation that doesn't assume the rather farfetched theory that Trump is an agent for Russia.

I'm not particularly well-versed in this area, but searching for the topic on Google easily found this information on sites such as Wikipedia, WSJ, Newsweek, and whitehouse.gov.