An evaluation by the U.S. intelligence has indicated that Moscow likely provided Ukraine with advanced and revolutionary anti-aircraft systems recently, which matches with the confirmation put forward by Ukraine supporting charges that Russia was the source of the weapon that shot down Malaysia Airlines Flight 17 killing 298.

The U.S. officials say they suspect that Russia supplied the rebels with multiple SA-11 anti-aircraft systems by transferring them illegally into eastern Ukraine with other military equipment, such as tanks and other equipment.

The officials believe the systems were moved back across the border into Russia following the shoot down of the jetliner, increases justification Ukraine charges is an attempt by the rebels and their Russian advisers to cover up their involvement in the crash.

A senior U.S. official said, “The assumption is they’re trying to remove evidence of what they did.”