Taliban to the rescue: Iran reportedly arms Afghan militants against US, ISIS — RT News:
Iran’s support of the Taliban is an alliance of convenience, according to the report. Iran is a Shiite country while the Taliban is Sunni, a difference that is difficult to bridge. In 2001, Tehran didn’t object to the ousting of the Taliban from power by a US-led invasion.
However, things have evolved, and with Taliban influence in Afghanistan growing, having a hand in it is becoming a useful asset. In 2013, the Iranians officially invited a Taliban delegation to an Islam conference.