If Russia is saying this to the media, you can bet that Iran has had nukes for a while now.
Russia may be aware of a pending nuclear attack somewhere by the Iranians, and they are trying to distance themselves from the blowback, as Russia was the primary enabler for the Iranian nuclear program.
Yep we bomb Iran they retaliate oil goes over a hundred and the world’s second biggest oil exporter with safe pipelines to its customers rakes in the moola. I wouldn’t even put it past the loudest voices for war in this country to have some nice safe investments dealing with this.