He just realized that the US via NATO will use Finland as the next battering ram against Russia, just as they did with Ukraine.
Interesting Articles:
New Russian Long-Range Drone Appears In Ukraine
Potentially capable of flying a range of missions, the Gerbera appears to be a Russian-developed complement to the Shahed-136 series.
https://www.twz.com/air/new-russian-long-range-drone-appears-in-ukraine
[ Colored black; uses radar absorbing foam; uses UKR internet; and for long range, uses relay drone ]
He just realized that the US via NATO will use Finland as the next battering ram against Russia, just as they did with Ukraine.