Mahmudali Chehreganli, the self-proclaimed leader of the South Azerbaijan National Awakening Movement, has not been allowed into Azerbaijan since 2006. From exile in Washington, he advocates for the northern, ethnic Azerbaijani-majority part of Iran to secede. It is a position that is so sensitive to Tehran that, under an informal agreement between Azerbaijan and Iran, Baku has for years blocked him from entering the country. But as tensions have spiked between Azerbaijan and Iran, for the first time in many years, Chehreganli has made multiple appearances on Azerbaijani television, including …