According to who?
Some blog?
The experts have been saying this since the mid-70’s. The reason to not do anything about it was always that our enemies either didn’t have a nuke to use or didn’t have a way to deliver it vie the southern hemisphere. Both of those things have changed under Obama. We did have balloons that were monitoring the skies to the south but Obama got rid of that because its primary purpose was to stop illegals and drug smuggling, and we know he considers it unconstitutional to actually have a border. At least that’s the fig-leaf answer for why he’s leaving the southern skies wide open, with no eyes watching there. Fact is, he’s done everything necessary to make sure our enemies have exactly what they need - right when they need it (at the end of his last term so there can be a catastrophic event preventing any new POTUS from being inaugurated and extending his time as CINC to the “8-10 years” he told us he’d be POTUS in July of 2008.
I posted a thread that had a bunch of links for sources but just googling could give you a bunch more.