The prime suspect behind the MH17 tragedy is the self-proclaimed defence minister of the Donetsk People's Republic, Igor Girkin.
According to the
Sydney Morning Herald, the former intelligence
officer is known by the name Strelkov - or "shooter" and has even shot
his own troops for insubordination.

The spotlight fell on Girkin (
left) after he reportedly posted a message on a Russian social media page, which read: "We did warn you - do not fly in our sky."
The post was later removed when it became clear that the plane was a civilian aircraft and not a Ukranian military plane.
The
Sydney Morning Herald pointed out that "no amateur can bring down a passenger jet streaking across the sky."
"Don't be lulled into believing any trooper with a rocket-propelled
grenade launcher on his shoulder could carry out this attack.
"The professionalism required points to Girkin and his Russian-backed separatists as the most likely suspects.

"They
have captured missile batteries mounted on trucks, and are suspected to
have been supplied with Russian-made 'needle' portable launchers that
can be carried by a man," reads the report.
As Ukraine and pro-Russian separatists blamed each other for the crash
of MH17 Boeing 777, a sophisticated missile system has been brought into
the public limelight – the Russian-made 9K37 Buk.
Confirmation that a missile was involved will only come if someone
admits firing one, or if crash investigators find shrapnel and other
tell-tale signs on the aircraft debris and the bodies recovered.
Nevertheless, the use of a missile was raised soon after the MH17
disaster by a Ukrainian Interior Ministry official who said pro-Russian
forces had used the missile to bring down the plane.
However, the self-proclaimed Donetsk People’s Republic has denied having missiles in its possession.

A
medium-range surface-to-air missile such as Buk is necessary to bring
down an aircraft at a cruising altitude as shoulder-fired missiles
(called Manpads, or Man-Portable Air Defence System), favoured by
insurgents worldwide for their portability, lack the range needed.
Manpads can only threaten commercial airliners during take-off and
landing, when it is flying relatively low and slow. The earliest version
of the Buk missile has a maximum engagement altitude of 14 kilometres.
The MH17 was reportedly flying at about 33,000 feet (10km) high.
Airspace MH17 was in was deemed 'open'
According to a report in British newspaper
The Guardian, the
Ukrainian authorities had banned flights at 32,000ft (9.75km) and below
in the area where MH17 crashed at the time of the incident, and the
airspace it was flying was deemed "open". That airspace in eastern
Ukraine is now closed to all civilian air traffic.

The
radar-guided missile weighs just over half-a-tonne and is typically
launched from the top of an armoured vehicle or a ship, in contrast to
Manpads that can be carried and fired by a single person and are
designed to attack low-flying aircraft and helicopters.
Various versions of the missile, carrying nicknames such as "Grizzly"
and "Gadfly", have been fielded since 1979 in Russia, Ukraine, China and
other countries.
It had seen combat on both sides of the 2008 South Ossetia war between
Russia and Georgia, during which defence analysts noted the Russian Air
Force had taken heavy casualties relative to the small Georgian military
and could not develop an effective counter-measure against a missile
system it created.

However, the question remains: If a missile brought down the MH17, who fired it?
"It's a very capable system, proven under real-world conditions,"
Foreign Policy
magazine quoted a political risk consultancy Wikistrat researcher
Andrew Bowen as saying, while noting that the system is difficult to
use.
"These systems require a large amount of technical know-how, unlike
these Manpads, which are basically 'point-and-shoot'," Bowen said.
Foreign Policy also reported that Ukraine has such missiles in
its possession. However despite denials, so does Donetsk, which is said
to have a missile system similar to Buk.
Donetsk had acquired Buk missiles, says report
The magazine quoted Russian newswire
Itar-Tass as reporting on
June 29 that Donetsk had acquired Buk missiles, and said the group had
even bragged about its acquisition on Twitter.
The posting, also dated June 29, has since been removed and can only be viewed via Google’s cache.

"An
Associated Press reporter spotted what was described as 'a launcher similar to the Buk missile system' near the town of Snizhne.
"On Thursday, a Twitter account associated with Maidan protest movement
in Kiev posted a photograph purporting to show a Buk launcher in the
town of Torez, which is near the crash site and has been the scene of
fighting between separatist and government forces," the report added.
The report also noted that while Ukraine does have Buk missiles near the
crash site, these missiles in the region were only used against
Ukrainian government aircraft.
Meanwhile, deputy editor of the Polish magazine
Dziennik Michal
Potocki, who had been studying the conflict in Ukraine, agreed that the
separatist group is responsible for shooting down the Malaysian
airliner.
"It cannot be the Ukrainian side - they do not need to use
surface-to-air missiles as the separatists do not have airplanes as for
now. It was probably a missile system called Buk," Potocki told
Malaysiakini in an email today.
He also pointed out that just before news broke that MH17 had crashed,
separatist leader, Igor Strelkov, posted on a Russian social media site
that two supposedly Ukrainian aircraft had been shot down, saying that
they were "an Antonov and probably a Sukhoi".
"Only after we got the news that it was Boeing - the separatists started to blame the Ukrainian side," Potocki said.
MH17 had been using a Boeing 777-200ER aircraft for the Amsterdam-Kuala
Lumpur flight, which is the same model used for flight MH370 that went
missing on March 8.
All 295 on board perished in the incident.