Here is a link to Google cache of Poroshenko's release about the conversation with Cameron.--the original version. The story of the column was inserted a few hours later. The page has a link to the current copy/altered of the document.
The chap is said to be a heavy drinker too, maybe this is related.
Ooops. I should have said that the original version of the release does not mention any Russian column whatsoever.