The secret deployment to Azerbaijan, reported by CNN for the first time, was one of several military positions Israel maintained across the Middle East that gave its military unprecedented reach, highlighting the role Iran’s neighbors played — some with permission, some likely without — in facilitating operations against Tehran and becoming entangled in the conflict.

The locations in Azerbaijan were among numerous covert military sites and bases in multiple countries, the sources told CNN, including in Iraq, the United Arab Emirates, and Somaliland. The forces, initially planned as potential rescue teams in the event of an emergency, expanded in scope to become military and intelligence gathering positions.