Russian analyst and adviser Sergei Karaganov is warning that Russia could use nuclear weapons, saying “millions” could die in Europe if NATO escalates involvement connected to Ukraine.

Multiple outlets report Karaganov’s comments in which he links a potential nuclear response to scenarios including NATO sending troops to Ukraine and actions that would affect Russia’s Kaliningrad region. The articles frame the remarks as a warning about the catastrophic humanitarian impact of a nuclear strike.

Coverage differs mainly in wording and emphasis: some outlets use stronger, alarming language around “doomsday” and imminent annihilation, while others focus more on the specific trigger conditions Karaganov mentions. Across reports, however, the central theme is consistent: Karaganov presents nuclear escalation as a possibility tied to Western military involvement in the Ukraine conflict, and he asserts that civilian casualties could be very large if it occurs.