Russia is not known for taking its responsibity in solving conflicts and other crises in the world. Russia's statement is a hollow threat, because Russia has no clout to back up this ridiculous warning. Russia is irrelevant, just a annoying paper tiger, nothing more. If the US wishes to attack Iran, Russia will stand by idly and watch.
5 tourists rescued from Hebron after being hit by firebomb; 2 hurt (Haaretz)
from the article: Russia warns Israel and West not to attack Iran over nuclear program