Russia's S-300 deal with Iran is going ahead

In a report headed Russia has not delivered S-300 missile systems to Iran - source, the RIA Novosti agency makes it clear that the contract for the delivery has none the less been signed and is going ahead:

S-300 systems have not been yet delivered to Iran under the contract concluded two years ago. The contract itself, though, is being gradually executed," the source in the Federal Military-Technical Cooperation Service told RIA Novosti.

The news comes just days after reports speculated that Russia might be reconsidering the deal, which if implemented would effectively preclude the chance of a negotiated settlement with Washington.