Putin said Russia was doing everything possible to allow a team of experts from the International Civil Aviation Organization, a UN agency, to investigate the scene. He again criticized the Ukraine government authorities in Kiev for reigniting the fighting with the pro-Russia rebels who control the crash site.
"We can say with confidence that if fighting in eastern Ukraine had not been renewed on June 28, this tragedy would not have happened," Putin said. "Nobody should or does have a right to use this tragedy for such mercenary objectives."
Yatsenyuk, Ukraine's prime minister, angrily called on Russia to halt what he said was its support for the rebels.
"They have to stop, and President Putin has to realize, enough is enough," he said. "What we expect from Russia: To de-escalate the situation, to withdraw their agents, to close the border, to stop their support for these bastards, and to stick to international law and international observations."
A team of international monitors, including three from the Dutch National Forensic Investigations Team, were to visit both Torez and the crash site later Monday.
Dutch Prime Minister Mark Rutte, whose country lost 192 citizens on the plane, told a news conference that repatriating the bodies was his "No. 1 priority."
Rebel leader Alexander Borodai denied his fighters were trying to tamper with evidence at the site, saying the bodies would be turned over to a team of Malaysian experts. A group of investigators that included Malaysian officials was in Kiev, but said they wouldn't go into rebel-held areas until they get better assurances about security.
Despite Borodai's claims, it was clear that the rebels were interfering in the investigation.
Lyubov Kudryavets, a worker at the Torez morgue, said the evening the plane went down, a resident brought in the bloodied body of a young child. On Saturday, militiamen came to take away the body away, she said.
"They began to question me: `Where are the fragments of rocket? Where are the fragments from the plane?'" Kudryavets said. "But I didn't have any wreckage. ... I swear."
Experts said even if investigators were granted access now to the site, it might be too late.
"Even without any deliberate attempt at a cover-up, the crash site is already compromised in forensic terms," said Keir Giles, an associate fellow at the Chatham House think tank.
He said a reconstruction of the aircraft fuselage and wings would show how the missile struck the plane and what type it was.
"If any aircraft parts have already been removed ... this compromises the objectivity of the investigation," he said.
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