At September 26 2016 Russian Ministry of Defense showed primary radar recordings. The Russians tell that there were no military aircraft near MH17. The Joint Investigation Team concluded this as well.
So this whole Carlos story is a complete nonsense story.
A Twitter account claiming to be working at Kiev Air Traffic Control sent Tweets at July 17 2014 suggesting Ukraine shot down MH17.
Soon it turned out this was a fake account. However lets double check the times he sent his Tweets.
Ukraine ATC stated this person did not work as ATC. Spanish people in Ukraine did not know him. He lived at that time in Romania. Also someone working at Kiev is unlikely to be able to watch the radar screen of Dnipropetrovsk ATC. MH17 was at the time of the crash controlled by Dnipropetrovsk ATC.
It was also very suspicious the man was interviewed by Russia Today in May 2014. Another weird aspect was that @spainbuca followed lots of anti-EU and anti-Israel Twitter accounts. Also @Spainbuca sent Tweets which were anti Israel. Not a typical Air Traffic Controller.
On Internet various sites show a time of the first Tweet of 10:21. Lets find out what the exact time of the Tweets was.
The Twitter account @spainbuca was deleted quite soon after July 17. But webarchive has an archive of the Tweets.
The time of a Tweet is displayed in the timezone set in the preferences of the Twitter account. To find out the time webarchive uses we need a reference. I compared Tweets of Eliot Higgins archived by Webarchive at 16 July 2014 by the date the Twitter search function reports. I found out the time Webarchive uses is UTC-7.
So this brings us to a time of the Carlos tweet of 08:38 + 7 hours = 15:38 UTC.
The Flight Data Recorder stopped recording at 13:20 UTC.
So @Spainbuca was the first try of Russia to mislead the audience.