Iran, Russia, and uranium enrichment 2

A couple of weeks ago, there seemed to emerge a possible breakthrough in the ongoing Iranian nuclear crisis, with Iran agreeing in principle to a Russian proposal for a joint Iranian-Russian uranium-enrichment program.

But, alas, there has been no such breakthrough.

The Washington Post reports: "Iran rejected a Russian proposal to enrich uranium on its behalf Sunday, closing the door on what had been the most promising diplomatic resolution to international concerns over its nuclear program." Indeed: "Iran had dismissed the Russian overture when it was first offered last year, insisting that any deal allow uranium enrichment on Iranian soil." Which would, of course, defeat the purpose.

So what now? Are we ready for the other options?