KYIV, Sept. 17 - The Russian Defense Ministry on Monday changed its story on who shot down Malaysia Airlines Flight 17 over Ukraine in July 2014 in an apparent attempt to quell investigator findings pointing to Russian unit behind the attack.

The attack, which killed all 298 people on board, was blamed by an international investigator team on Russian anti-aircraft unit that had illegally crossed the Ukrainian border.

The jet was shot down by a Soviet-made missile Buk over rebel-held eastern Ukraine in July 2014.

The Netherlands and Australia announced in May that they believe the missile was transported to Ukraine from a military unit in the Russian city of Kursk.

Russia has vehemently denied involvement and has over the years come up with various theories as to the cause of the crash, generally laying the blame on the Ukrainian side.

The Russian Defense Ministry has argued since July 2014 that a Ukrainian fighter jet had been identified near Flight 17, but on Monday admitted that was fake news.

Lt. Gen. Nikolai Parshin, chief of the Missile and Artillery Directorate at the Russian Defense Ministry, told reporters on Monday the military had studied and declassified archives at the research center outside Moscow that produced the Buk missiles after the Dutch investigators displayed parts of the missile and their serial numbers, The Associated Press reported.

Parshin said the Russian archives show that the missile that was made of these parts was transported to a military unit in western Ukraine in 1986, and to Russia’s knowledge never left Ukraine.

Oleksandr Turchynov, secretary of Ukraine’s Security and Defense Council, said on Monday that Russia’s claim is “yet another failed fake report that the Kremlin made up in order to cover up their crime that has been proven by the official investigation as well as independent experts.”

Asked about the possibility that the separatists may have seized the missile system during fighting in 2014, Defense Ministry spokesman Maj. Gen. Igor Konashenkov conceded that Russia does not have any documents proving otherwise but pointed to the statements of Ukrainian officials who have denied that separatists seized any of their Buks.

The Joint Investigation Team, set up by nations that lost citizens in the MH17 crash, said in a statement that it has “taken note” of the information that the Russian military made public on Monday. The investigators said they had asked Russia for information regarding the serial numbers before but had not received a reply.

The separatists in the weeks prior to the plane crash bragged on social media about shooting down Ukrainian military aircraft. On the day that MH17 crashed, a rebel commander posted that his troops had shot down a Ukrainian military plane. He later said his account has been hacked and that the rebels did not shoot down any aircraft that day. (ap/ez)