While Khamzat Chimaev and Khabib Nurmagomedov were never true enemies, they did share a brief rivalry, which was nipped in the bud by Chechen leader Ramzan Kadyrov.
https://www.sportskeeda.com/mma/news-protect-mountains-khamzat-chimaev-buries-hatchet-team-khabib-nurmagomedov-islam-makhachev-s-welterweight-title-win