"A Ukraine Air Force military jet was detected gaining height, it's distance from the Malaysian Boeing was 3 to 5km," said the head of the Main Operations Directorate of the HQ of Russia's military forces, Lieutenant-General Andrey Kartopolov speaking at a media conference in Moscow on Monday.

"[We] would like to get an explanation as to why the military jet was flying along a civil aviation corridor at almost the same time and at the same level as a passenger plane," he stated.