Lithuanian Foreign Minister Gabrielius Landsbergis is convinced that Russia will continue to "intensify instability" in the world if it is not stopped now.

Landsbergis stressed at a meeting with European Commission President Ursula von der Leyen in Bucharest that a hesitant response only gives Russia more courage.

"Without deterrence, the Kremlin will continue to expand the zone of instability and foment new conflicts. This war must be won, and won decisively," he said.

Landsbergis added that the war unleashed by Russia has become a challenge to the international order.

He also said that Ukraine should be guaranteed long-term defence support.

Landsbergis warned earlier that Russia could launch a sudden attack on NATO countries.

He also believes that Europe needs to find a creative solution to help Ukraine in its war against Russia.