A State Department official told lawmakers Thursday he was unsure of the precise location of tons of low-enriched uranium shipped out of Iran on a Russian vessel as part of last summer’s nuclear agreement.

Ambassador Stephen Mull, the lead US official overseeing the deal’s implementation, said during testimony before the House Foreign Affairs Committee that the stockpile is a Russian custody issue.

Russia is every bit as trustworthy as Iran, though. Isn’t it?

Don’t know means don’t know. On what basis, now, do we conclude the enriched uranium has even left Iran? Or isn’t back in Iran, if we can believe the carefully unnamed “senior administration official” who, leaking speaking without authorization assured the AP that the stuff had made it to Russia.