(CNN) House Intel Chairman announces ‘serious national security threat,’ sources say it is related to Russia. Quoting,

One of the sources who has seen the intelligence confirmed that “it is, in fact, a highly concerning and destabilizing” Russian capability “that we were recently made aware of.”

Sensitivity has two  possible roots:

• The need to protect sources and methods.
• Disclosure would affect society at large in a negative way.

“Destabilizing” hints the latter. One of my long-term concerns has been North Korea’s Plutonium, Iran’s Uranium / Suitcase Nukes,

where Russia may have obtained or retained custody of refurbished weapons, with possible deployment in the continental U.S.