At least according to the article: >Several times before the collision, the Su-27s dumped fuel on and flew in front of the MQ-9 in a reckless, environmentally

At least according to the article: >Several times before the collision, the Su-27s dumped fuel on and flew in front of the MQ-9 in a reckless, environmentally unsound and unprofessional manner. That could be argued to be more intentional than just faffing about.