The grammar structure を巡って (をめぐって) is used to express that something – a discussion, debate, conflict, or controversy – takes place concerning, regarding, or over a particular issue or topic. It highlights that the topic in question is at the center of some kind of dispute, deliberation, or exchange of opinions.
The verb めぐる巡る (めぐる) literally means "to go around" or "to revolve around," so を巡って carries the nuance that opinions, arguments, or actions revolve around a certain matter.
を巡って is most naturally used when the topic involves disagreement, debate, conflict, or multiple perspectives. It is not typically used for simple topics of conversation; rather, it implies that the matter is contentious or significant enough to generate discussion.
を巡る
を巡り: A slightly more formal or literary variant of を巡って, often seen in written language and news reports.
While について and にかんして関して simply mean "about" or "concerning" in a neutral sense, を巡って specifically implies that controversy, conflict, or active debate surrounds the topic. You would use について for a report or explanation, but を巡って when opinions clash or tensions arise.