Worst case scenario: The Taliban launch Afghanistan’s nuclear weapons simultaneously. The one hundred largest non-Muslim cities worldwide meet horrific destruction. It currently possesses as many as 160 nuclear weapons, produces enough fissile material for up to 15 warheads per year, and could be on track to surpass the U.K.'s arsenal. The Afghanistan-Pakistan border is over 1600 miles long, mountainous, and notoriously poorly governed on both sides.