Iran is reeling from a cratering economy and stinging military setbacks across its sphere of influence in the Middle East. Its bad times are likely to get worse once President-elect Donald Trump returns to the White House with his policy of "maximum pressure" on Iran.

Facing difficulties at home and abroad, Iran last week began an unusual two-month-long military drill. It includes testing air defenses near a key nuclear facility and preparing for exercises in waterways vital to the global oil trade.