Pro-Russian rebels, accused of allowing the looting of bodies as well as destroying evidence, continue to limit access to investigation and recovery teams.
Russian President Vladimir Putin, meanwhile, is facing the possibility of further sanctions as international leaders turn up the pressure on him.
While Mr Putin says he has urged rebels to co-operate, they say he had the necessary clout with the separatists.
The diplomatic escalation is turning into one of the most intense showdowns between Russia and Western Europe since the end of the Cold War.
The rebels are also accused of spiriting the weapons systems of the type used in the attack across the border to Russia.
They, in turn, say Ukrainian authorities are not interested in an objective investigation - that it is Ukraine that is thwarting the investigation.
The location of the plane's black boxes remains a mystery.
Dutch Prime Minister Mark Rutte, whose nation lost 193 citizens on the flight, called TV images of victims' property being handled by unauthorised people ''downright disgusting''.
Malaysia's Transportation Minister Liow Tiong Lai said the the integrity of the site had been compromised.
New Zealand Prime Minister John Key is among other leaders ''deeply concerned'' by the lack of access to the crash site.
Dozens of bodies were put into refrigerated rail wagons last night, rail workers said.
A senior official from the rebels' self-proclaimed Donetsk People's Republic said all 196 of the bodies found so far had been loaded into the wagons.
