There are reasons why Iran does not fear the Security Council ever enacting the sort of sanctions that would deter its nuclear ambitions.  From this morning's Boston Globe:

Russia has begun delivery of Tor-M1 air defense missile systems to Iran, a Defense Ministry official said Friday, confirming that Moscow would proceed with arms deals with Tehran in spite of Western criticism.

The official, who spoke on condition of anonymity because he was not authorized to discuss the issue, declined to specify when the deliveries had been made and how many systems had been delivered.

Ministry officials have previously said Moscow would supply 29 of the sophisticated missile systems to Iran under a $700 million contract signed in December, according to Russian media reports....

Russian officials say the missiles are purely defensive weapons with a limited range.

According to the Interfax news agency, the Tor-M1 system can identify up to 48 targets and fire at two targets simultaneously at a height of up to 20,000 feet.

Iran must conclude that if Russia is willing to sell it the weapons necessary to defend nuclear facilities, it cannot really be intending to force the halt of construction on those facilities.

If Iran is going to be stopped, it won't be as a result of a Security Council resolution.  None effective to that end will be forthcoming.