The pilot of MH17 'felt bad' flying over war-torn Ukraine so changed the normal course of the Malaysian Airlines flight - without realising he was heading towards a more dangerous zone, it has been claimed.
The fateful decision of the pilot led to the Boeing 777 being "blown out" of the sky by the Torez based rebels who believed it was a Ukraine military transport aircraft.
The latest theory has been put forward by Dr Igor Sutyagin, a professor in Russian Studies from the Royal United Services Institute.
Sutyagin told MailOnline a source, he refused to name, told him the pilot "felt uncomfortable" so fatefully changed the course of the flight.
His theory mirrors a route map created via Twitter user Vagelis Karmiros, who used data from Flightaware, the largest data tracking site in the world, showing the bizarre alternate Amsterdam to Kuala Lumpur route of MH17 on 17 July.
He said: "There is a Ukrainian mechanised brigade blocked by separatists near the Russian border."It's blocked on three sides by separatists and behind the brigade is the Russian boarder, so they can't get out. The Ukrainians try to resupply them from the air by transport aircraft.
"Now, the pilot of MH17 said that he "felt bad" and wanted to change course south to get out of the danger zone. But several kilometres to the south is a Ukrainian Army heavy transport plane, an IL76, or Candid, which has the same echo as a 777 on a radar screen.
"The two planes came close. They tried to shoot down the transport delivering supplies to the brigade. They believed that they had been firing at a military plane, but they mistakenly shoot down a civilian airliner."
President Barack Obama has since confirmed the plane was shot down by a surface-to-air missile launched from an area where the pro-russian rebels are based and who have been benefiting from armed support from Russia.
Amidst calls for a ceasefire in the region, the US president sidestepped blaming Putin for the atrocity, which the Ukrainian President Petro Poroshenko described as "an act of terrorism" until the facts are established.
Speaking at a press conference on Friday, Obama said: "A group of separatists cannot shoot down military planes without sophisticated equipment - and that is coming from Russia.
"We don't know exactly what happened. We can draw some conclusions, given the missiles which are capable of reaching 30,000ft.
"If Mr Putin makes a decision that he is not going to allow the flow of heavy armaments and men across the border into Ukraine, then it will stop.
"He has the most control over that situation - and so far he has not exercised it."
Reports have also emerged that Ukrainian intelligence services have filmed a missile launcher with two missing rockets being smuggled on the back of a truck to Russia.
Anton Gerashchenko, from Ukraine's interior ministry, said of the missing missiles that "it's not hard to guess why".
He told the Telegraph: "It was exactly these missiles which brought death to almost 300 innocent passengers of the ill-fated Malaysian Boeing."
178 Dutch and ten Britons are now among the confirmed dead including 80 children.