Iran and the United States are due to hold new talks in Geneva on Thursday over Tehran's nuclear program. The talks come as America has assembled the largest fleet of warplanes and aircraft in the Mideast in decades as part of President Donald Trump's efforts to force Iran into a deal after it saw nationwide protests against its theocracy.

WASHINGTON — Although weakened and facing a domestic crisis, Iran’s regime still has substantial firepower that could inflict damage on American interests and allies in the region, disrupt the global economy and trigger a protracted conflict in response to a U.