Photo from UNIAN

Answering a BBC Newsnight host’s question on how she thinks the rest of the world should view Vladimir Putin, Savchenko said: "And how did the world view Hitler? I think the civilized world cannot view positively a person who has an appetite to seize the whole world."

"This is not healthy behavior. It’s an illness," she said. "That’s why Putin is a sick person. He’s sick because of his egotism, his madness."

Savchenko has added that when such people are in power, they "do a lot of harm to the world’s harmony".

Read alsoFeygin on Savchenko visit to Moscow: "It looks very strange"That’s why such people must be stopped, and as quickly as possible,” she said.

Asked whether she believes Crimea will ever be returned to Ukraine from under the Russian occupation, Nadia Savchenko said this could be achieved "through economic force".

Read alsoFive countries align with EU's anti-Russia sanctions until mid-March"If sanctions are continued and an oil embargo is introduced, I think most Russian kleptocrats, oligarchs in power would tell Vova [Vladimir Putin] that his madness is too expensive for them," said Savchenko.