Probably that people are realizing that the fall of the Soviet Union didn't actually end the threat of nuclear annihilation, just pushed it to the backs of our minds. Now we know we have multiple potential civilization-ending crises hanging over our heads, and it's in the zeitgeist.

Well, the anniversary of the Hiroshima and Nagasaki bombs is in August. There's usually some news articles around that. That might spark some interest for people to do more research and then a few weeks later (now-ish) you get some new articles.