KIEV, July 15 – The Security Service of Ukraine has indisputable evidence of Russia's involvement in an attack on a Ukrainian An-26 military transport aircraft in Luhansk region on July 14, SBU chief Valentyn Nalyvaichenko said.

"There is incontrovertible evidence," he told reporters in Kiev on Tuesday, when asked whether the SBU has evidence that Russia was involved in the attack on the Ukrainian An-26 on Monday.