Yes. Many news sources reported on it. As for the actual content in question - here's an archive of a tweet of them boasting about having Buk missile launcher,

Yes. Many news sources reported on it. As for the actual content in question - here's an archive of a tweet of them boasting about having Buk missile launcher, the tweet was later deleted: http://web.archive.org/web/20140707150151/https://twitter.com/dnrpress/status/483248037629018112 http://web.archive.org/web/20140707150151/https://twitter.co... Here's a screenshot of the VK account where their (now former) commander and defense minister (and allegedly "ex" FSB member) claimed the downing of a Ukrainian plane, later the content was deleted: http://i.imgur.com/fi4Zkx6.png http://i.imgur.com/fi4Zkx6.png The Wikipedia article covers all that in depth: https://en.wikipedia.org/wiki/Malaysia_Airlines_Flight_17 https://en.wikipedia.org/wiki/Malaysia_Airlines_Flight_17