Jens Stoltenberg: If President Putin even thinks of doing something similar to a NATO country as he has done to Georgia, Moldova or Ukraine, then all of NATO will be involved immediately

The war in Ukraine is the most dangerous moment for Europe since World War Two, and Russia must not be allowed to win, NATO Secretary-General Jens Stoltenberg said.

Describing what Moscow calls a "special military operation" as an attack on the current world order, Stoltenberg said the alliance had to prevent the war from spreading.

"If President (Vladimir) Putin even thinks of doing something similar to a NATO country as he has done to Georgia, Moldova or Ukraine, then all of NATO will be involved immediately," Stoltenberg said.