For Washington, the logical next step against Iran is international sanctions; for Moscow, sanctions have so far remained a non-issue.
The U.S. administration either wanted to push Russia towards a tougher stance on Iran by putting its companies on notice, or it has given up on shifting its position; in both cases, however, the chance for hammering out a new “muscular” UN resolution in early September now appears transparently slim. The perfect irony in this partnership can be seen in the fact that sanctions have been introduced against Russia before they have taken shape against Iran.
Baev, Pavel K. (2006) Moscow Outraged by US Sanctions Against Two Russian Companies, Eurasia Daily Monitor. 7 August.