Marcus Kolga, a senior fellow at the Macdonald-Laurier Institute, says 'it's only with significant pressure' that the U.S. and Russia will 'arrive at a meaningful ceasefire.' This comes after U.S. special envoy Steve Wtikoff met with Russian President Vladimir Putin in Moscow to discuss a ceasefire agreement with Ukraine. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/