The phrase "major flashpoint" refers to a situation or an event that has the potential to cause conflict or escalate tensions. It suggests a point of intense disagreement or pressure that could spark a larger and more serious issue. Full definition
A prospective major flashpoint - a debate and vote on Trident - was deftly avoided. (totalpolitics.com)
With growth improving, there is unlikely to be a major flashpoint in the short term, in my view. (us.beyondbullsandbears.com)
President Trump moved to further dismantle his predecessor's policies as he resurrected a pipeline in the Dakotas that had become a major flashpoint for Native Americans, while reviving the Keystone XL pipeline, which had stirred years of debate over the balance between energy needs and environmental concerns. (nystateofpolitics.com)