Former Swedish Foreign Minister Tobias Billström said after the Ukraine war, Europe must be ready for further Russian aggression.

Mark Rutte warns allies to start ramping up preparations "for the scale of war our grandparents or great-grandparents endured".

Russia's growing aggression prompts NATO warning as recent railway blast in Poland and airspace violations signal escalating security threats across Europe.

NATO Secretary General Mark Rutte warned Thursday that members of the alliance could be “Russia’s next target,” calling for a rapid rise in defense spending to prevent a war similar to those seen by past generations.

NATO fighter jets were scrambled and air defense systems put on alert in Poland in response to Russia’s latest overnight drone and missile strikes in Ukraine.

Secretary-General Mark Rutte chastised some allies for moving too slowly when it comes to ramping up defense spending.

NATO chief Mark Rutte warned members of the military alliance must treat the threat posed by Moscow more urgently as they may be "Russia's next target."

The Kremlin said on Sunday that NATO Secretary General Mark Rutte's remarks about preparing for war with Russia were irresponsible and showed that he did not really understand the devastation wrought by World War Two.

As Georgia balances its aspirations to join NATO against mounting pressure from the Russian Federation, a new security partnership is taking shape in the South Caucasus.