However, I wonder.

Putin doesn't want war.  Why should he when Washington's arrogance is destroying the US and the empire.  Even Germany has had enough of Washington because of Washington's interference in German energy policy and sanctions on companies involved with the construction of the Nord 2 gas pipeline.  https://www.euractiv.com/section/energy/news/germany-and-eu-condemn-us-sanctions-on-gas-pipeline/ 

In France Washington's puppet, Macron, is showing independence by saying that Russia is part of Europe.  

As Putin and China have failed to protect Iran from a US/Israeli attack by forming a defense alliance with Iran, I suspect that Putin will prevent Iran from directly retaliating.  As Iran cannot afford to alienate Russia, any retaliation will come from proxies after they make a show of splitting from Iran.