Leopard, Russia is only doing this because oil is down, the Ruble value has lost more then 50% of it’s value and there economy is close to collapse so they need the money. Russia doesn’t has the money to defend anyone right now.
This is almost the same example of what is happening with Cuba where now they want to do business with the U. S., why well Russia is down and can’t help them, Venezuela is also down because of oil prices too so there is only one place to go and that is the U. S.
I see Israel going after Iran soon all by them self. The Russian military technology is not at the level of the U. S.
What can Russia do if Israel hits Iran? Not much.