That Russia won't allow Iran to build nuclear weapon is a logical move.
Now they seem
very serious to act if Iran doesn't comply. They have never been that serious before. I'm surprised.
Let's see if China will follow in that direction.
Moscow could back a sanctions resolution the Western powers have drafted and which they want to discuss in the U.N. Security Council this week.
"If Iran in the next few days does not stop the enrichment activities of its heavy water project then yes, Russia ... has taken upon itself certain commitments... to support the resolution that has been drafted in the past month"
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full article 
