“Please do not underestimate this war criminal. He's not an idiot. He's a KGB operative,” former Ukrainian Prime Minister Arseniy Yastenyuk said when asked about Russian President Vladimir Putin and a possible EU envoy at direct talks with the Kremlin.

“Putin will choose someone he can recruit," Yastenyuk said.

In an interview with Euronews' Europe Today on Wednesday, Yastenyuk shared his advice for any talks with Putin based on his own experience meeting Russia’s leader.

“He always has a sense of whether you are weak or you are strong. So he makes a sniff test of each person he meets," Yastenyuk recalled.

“It all depends on the personality who is to talk to Putin ... and whether this personality, whether this political high-profile political figure would have additional ammo that supports his talk," he explained.