MOSCOW, July 18 (Xinhua) -- Neither the Buk missile systems nor any other weaponry of the Russian Armed Forces had been transferred cross the border into Ukraine, Russian Defense Ministry said Friday.
"It is impossible to do this secretly," the ministry said.
"Speaking about Kiev's another allegation about the detention of two Buk spotters, who are allegedly Russian citizens, we would like to explain that artillery observers are needed only for those weapons whose targets are on the ground," it said.
Earlier Friday, the Russian ministry voiced suspect that the Kiev government was responsible for shooting down the Malaysia Airlines flight MH17 when it was en route from Amsterdam to Kuala Lumpur. The flight with 298 people on board crashed Thursday in eastern Ukraine, with no survivors found so far.
The ministry said in a statement that the airspace where the plane was brought down "is covered by two Ukrainian S-200 long- range anti-aircraft missile systems and three Buk-M1 middle-range missile systems."
Russian air defense monitoring on Thursday detected activity of the Ukrainian radar station Kupol, which is an integral part of the Buk-M1 system that can launch a missile to shoot down the airliner, it added.
However, the Ukrainian National Security and Defense Council denied any role of Ukrainian forces in the tragedy.
Meanwhile, Moscow also refuted Australian Prime Minister Tony Abbot's public accusation of Russia's role in the crash.
"Without troubling himself to present proof, Mr. Abbot named those guilty of the crash merely with conjectures, even before the investigation started," Russian Foreign Ministry spokesman Alexander Lukashevich said.
"Mr. Abbot should have addressed his demands on cooperation in investigating the tragedy not to us but to the Ukrainian authorities that bear full responsibility for what happens on this country's territory."
"Russia has reiterated that it insists on a completely impartial and transparent investigation into the causes and circumstances of the accident, and declared its willingness to contribute, in close interaction with the partners concerned, to making the real picture of what happened to the world," he said.
The cause of the crash has yet to be determined. Kiev and the insurgents have traded accusations over the responsibility.