He told this to the reporters at the Embassy of Malaysia in Ukraine, Ukrainian Pravda reports citing UNIAN.
According to Poroshenko, an unprejudiced and impartial investigation, which the terrorists are hindering, must be conducted.
"I have instructed that Ukrainian servicemen should not carry out military operations and open fire within a radius of 40 kilometres from the scene of the tragedy in order to ensure the functioning of experts," Poroshenko said.
He stressed that the terrorists and those who support them "have no more excuses even for a temporarily admission delay of the representatives of the Investigation Commission, there is no more opportunity to delay the transfer of the bodies to representatives of the countries in order to return their bodies home."
The President stressed that, according to his information, the representatives of the DPR behave outrageously on the site of the crash, informs Interfax-Ukraine.
"Some of the bodies of 298 innocent victims still cannot be found because of criminal position of those barbarians. The toys of 80 deceased children are stolen by looters from the scene," Poroshenko said.
Poroshenko added that it is global tragedy but not a conflict in eastern Ukraine.
"This crime has only confirmed another proof that it is a global threat to the security of the world and we must act just as decisively," he added.
According to him, the militants committed three serious crimes: the terrorists' attack "when Russian rocket was launched," mistreatment of dead bodies, and destruction of evidence
"Ukrainian Investigation Commission and the commission formed by the ICAO are being impeded to do their job," he said.