Since September, Iran's currency has lost about 35 percent of its value against the U.S. dollar and the euro. That has created new problems for the ruling radicals in Tehran. It may explain their recent saber rattling, though the regime's bellicosity in general has become a persistent concern.
Financial woes created in large measure by U.S. economic sanctions against Iran have made it harder for the regime to fund itself - and to pursue its weapons buildup.
It should be noted President Barack Obama's administration was forced reluctantly into implementing some of the sanctions. Late last year, Obama publicly opposed some sanctions, especially those involving transactions among Iranian banks and those in other countries. Congress reacted by passing legislation in effect forcing the White House to proceed with the sanctions.
And now, the very actions Obama opposed seem to be having the desired effect of making life more difficult for the Iranian government.
It seems improbable the sanctions will force Iran to back away from its program to build nuclear weapons and to improve its military force projection capabilities. Frankly, the campaign was allowed to proceed virtually unhampered for so long that it may be unstoppable now. Both former President George W. Bush and Obama bear some blame for that.
Better late than never, however.