Northern Afghanistan is at risk of falling to the Islamic State. Their latest attack in Sar-e Pul Province killed 15 Taliban fighters at prayer, but it's just the latest in a series of ongoing conflicts that have seen hundred killed on both sides. The ISIS stronghold in Nangarhar Province is pushing westward in an effort to undermine the al-Qaeda-affiliated Taliban there.
All the groups involved in the fighting, including those who support the Ghani government in Kabul, are having the same logistical and intelligence problems faced by anyone fighting in the mountainous country — fighters and civilians switch their allegiances as often as their clothes.
The two terrorist groups are vying for power in the country's eastern and northern regions. The Taliban want to push the Islamic State out of the country before it can establish a clear footprint. In June 2018, the Taliban launched two sweeping offensives in Kunar and Laghman. ISIS, for its part, did not observe the recent three-day ceasefire for the Eid al-Fitr holiday observed by government and Taliban troops.
Related: Afghanistan just called a temporary ceasefire with the Taliban
The black represents ISIS support as of December 2015.
(Institute for the Study of War)
It was during that holiday, the holiest of days for the world's Muslim population, that ISIS killed 25 in a suicide car bomb attack in Nangarhar. According to The National, a newspaper based in the United Arab Emirates, ISIS sources say the recent Taliban advances were effective and that the Islamic State is experiencing "setbacks" in the rocky provinces of Kunar.
Fighters from Islamic State arrived in force in Afghanistan in 2015, just as ISIS fortunes in Iraq and Syria started to turn sour. The strength the group projected outside the country in recent years invited many defections from other terrorists groups and militias, especially from the Pakistani Taliban. The Afghan Taliban and ISIS have been butting heads ever since.
The Taliban dislikes the Islamic State's brand of Islamic fundamentalism.
A lot. A whole lot.
ISIS hates that the Taliban draws its legitimacy through ethnic and nationalistic foundations, not Islamic jurisprudence like the kind declared by the Islamic State. To ISIS, Afghanistan is a province they call "Khorasan" and subject to the rule of their self-proclaimed caliphate. The Afghan Taliban's alliances with Pakistan's intelligence services and even Shia Muslims are just a few more reasons ISIS declares the Taliban to be non-Muslim nationalists.
There will be no possibility for peaceful resolution between the two.