Why are there no good choices? From Crimea to North Korea, from Syria to Egypt, and from Iraq to Afghanistan, America apparently has no good options. If possession is nine-tenths of the law, Russia owns Crimea and all we can do is sanction and disinvite—and wring our hands.
Iran is following North Korea's nuclear path, but it seems that we can only entreat Iran to sign the same kind of agreement North Korea once signed, undoubtedly with the same result.