It is reported in United States Assessment of the Downing ofFlight MH17 and its Aftermath.
"Over the past month, we have detected an increasing amount ofheavy weaponry to separatist fighters crossing the border fromRussia into Ukraine. Last weekend, Russia sent a convoy of militaryequipment with up to 150 vehicles including tanks, armoredpersonnel carriers, artillery, and multiple rocket launchers to theseparatist. We also have information indicating that Russia isproviding training to separatist fighters at a facility insouthwest Russia, and this effort included training on air defensesystems", indicated in the statement.
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"Pro-Russian separatist fighters have demonstrated proficiency withsurface-to-air missile systems and have downed more than a dozenaircraft over the past few months, including two large transportaircraft," mentioned in the statement.
At the time that flight MH17 dropped out of contact, we detected asurface-to-air missile (SAM) launch from a separatist-controlledarea in southeastern Ukraine. We believe this missile was anSA-11.
Social media postings on Thursday show an SA-11 system travelingthrough the separatist-controlled towns of Torez and Snizhne, nearthe crash site and assessed location of the SAM launch.
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"Ukraine also operates SA-11 systems, but we are confident noUkrainian air defense systems were within range of the crash.Ukrainian forces have also not fired a single surface-to-airmissile during the conflict, despite often complaining aboutviolations of their airspace by Russian military aircraft," claimedin the document.
Shortly after the crash, separatists claimed responsibility forshooting down a military transport plane on social media. Soon theseparatists deleted social media posts boasting about shooting downa plane and possessing a Buk (SA-11) SAM system.
Audio data provided to the press by the Ukrainian security servicewas evaluated by Intelligence Community analysts who confirmedthese were authentic conversations between known separatistleaders, based on comparing the Ukraine-released internet audio torecordings of known separatists.