They’re not helping on North Korea as of now either, but for different reasons.
It‘s funny.
Even EU, Turkey (America’s ally in the NATO), won’t help Trump on Iran.
First of all, it’s in Russia’s interest to keep them against us. Second, Russia is to Iran what Turkey is to the U.S. Both Turkey and Iran get to tell the bigger country what to do, because they are needed.
The question is will Russia interfere with a revolution?
A democratic Iran would be a game changer. It may be wishful thinking but crossing off an enemy would be spectacular just like if we turn the Norks.
Look at the map and ask yourself: “does Russia border Iran?”
Then ask yourself: “does the US border Iran?”
Personally, we do not need any help from them - simply nullify the treaty and re-institute every sanction under the book on Iran....!