ISIS-K is behind the terrorist attacks in Russia. ISIS-K also wants to overthrow the Taliban and take over Aghanistan(and parts of Iran, Turkmenistan, Tajikistan, Uzbekistan. Kyrgystan and Pakistan).

Literally all the countries in the world are fighting or oppose ISIS. The US has probably worked with the Taliban and has hit ISIS-K inside Afghanistan. And it might not be official but if you want to hit terrorists, you need to cooperate with the Taliban because the US has basically no presence in Afghanistan atm.

Obviously for Russia it is even more important to cooperate with the Taliban, considering that ISIS-K hit Russia.