Russia's blocking the formation of a tribunal to investigate the downing of the Malaysia Airlines MH17 flight indicates its involvement in the crash, Ukrainian President Petro Poroshenko said.

"Russia is blocking the formation of a tribunal, which is de facto a guilty plea," Poroshenko said in Kharkiv on Friday at a joint briefing with Lithuanian President Dalia Grybauskaite.

At the same time, the Ukrainian president recalled the new reports, which contain "a direct evidence of the Russian Federation's involvement in the terrorist attack on the Malaysian aircraft," which have appeared recently.

As reported, the Boeing 777 belonging to Malaysia Airlines flying from Amsterdam to Kuala Lumpur (Malaysia) was shot out of the sky killing all 298 passengers on board.

The international joint investigatory group (Joint Investigation Team, JIT), which is comprised of prosecutors and law-enforcement officials from Ukraine, the Netherlands, Belgium, Australia, and Malaysia, as well as EU legal officials, on September 28, 2016 presented its findings in the criminal investigation of the tragedy.

"The JIT concluded that MH17 was downed by a rocket, Series 9M38, launched from a self-propelled ground-to-missile launcher BUK-TELAR, in a farming area in the region of Pervomaiske village. The area is currently held by pro-Russian militant groups. Investigators said missile complex was delivered to Ukraine from the Russian Federation and returned there after the downing," the findings said.

In early June 2017, the British investigative journalists group Bellingcat said it found a photo of the Buk 323 missile launcher of the Russian 53rd anti-aircraft missile brigade taken before the launcher was used to down the MH17 passenger flight in Donetsk region in 2014.

In mid-November 2016, Malaysian Transport Minister Liow Tiong Lai said that investigators had established the names of a hundred individuals suspected of involvement in the crime and that they will be named in 2017.