That's kind of by design. What other effect do you think the total economic embargo would have? It's not like they're some super advanced country that's independent of anybody else for tech.
Good (for the US) news is, it's working. They're getting ready to negotiate, hence the UK tanker intercepts etc. Weak negotiating position, need bargaining chips. I kind of agree with Lindsey Graham: if you just want nuclear power, there's no need whatsoever to enrich your own uranium. You can buy fuel for reactors from the enriching nations, no problem. I'm sure, given the situation, you could even negotiate the price down to nearly nothing, as well.
Good (for the US) news is, it's working. They're getting ready to negotiate, hence the UK tanker intercepts etc. Weak negotiating position, need bargaining chips. I kind of agree with Lindsey Graham: if you just want nuclear power, there's no need whatsoever to enrich your own uranium. You can buy fuel for reactors from the enriching nations, no problem. I'm sure, given the situation, you could even negotiate the price down to nearly nothing, as well.