Putin isn’t short-sighted. It’s a matter of strategy. Iran is an ally of Russia, and Russia has been helping them for years with their nuclear program. Russia is not afraid of Iran because they know who Iran will be fighting a war with— Israel and the United States.
Iran is Islamic. The Chechnyans are Islamic.
Yes, Russia has been helping Iran thanks to Jimmy Carter who transitioned Iran into a Russian ally from a Western ally.
The technology that Iran develops, will be given to terrorist groups. That information will proliferate across the region.
There will be payoffs. Technology and hard objects will be transferred to terrorists.
Iran has no control over where those things will go. What’s more, it doesn’t care as long as it doesn’t blow up on it’s soil.
This will make international arms control almost impossible to effect.