Fox News contributor Dan Hoffman joins 'Fox & Friends' to discuss Ukraine's claims that Russia has violated the partial ceasefire deal and Putin's threat to Trump over his effort to acquire Greenland. #FoxNews #greenland #donaldtrump #putin Subscribe to Fox News! https://bit.ly/2vBUvAS Watch more Fox News Video: http://video.foxnews.com Watch Fox News Channel Live: http://www.foxnewsgo.com/ FOX News Channel (FNC) is a 24-hour all-encompassing news service delivering breaking news as well as