Russian President Vladimir Putin lambasted those who were exploiting the crash of Malaysia Airlines Flight MH-17 for "mercenary objectives."

On Monday, Putin said Russia was working to let experts from United Nations (UN) agency International Civil Aviation Organization investigate the crash site in eastern Ukraine.

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He also lashed out at Kiev-based Ukraine authorities for restarting the feud with pro-Moscow rebels who now control the area where the passenger jet crashed, the Associated Press reported.

The Russian president said that the tragic event would not have taken place if the fighting in Ukraine was not reignited on June 28.

Putin is presently under international pressure to stop the rebels in Ukraine and give international investigators gain access to the site where Flight MH-17 which carried 298 people on board went down after it was shot down on Thursday.

Meanwhile, the U.S. on Sunday presented strong evidence that the rebels used a Russian ground-to-air missile to shoot down the plane.

Secretary of State John Kerry told CNN that Russia is training the separatists and supplying them with arms.

European foreign ministers are set to meet in Brussels on Tuesday to discuss additional sanctions for Russia.

Anger is brewing in the international community due to the investigators' limited access to the crash site in Ukraine.

On Sunday, pro-Russia rebels piled almost 200 bodies from the jetliner into four refrigerated train cars and used cranes to move large sections of the aircraft. Critics condemned the rebels' efforts to tamper with the crash site.

British Prime Minister David Cameron blaming Russia for "destabilizing" Ukraine and supporting "thuggish militias" and said these actions directly led to the tragic event, the Sunday Times relayed.

Dutch Prime Minister Mark Rutte, who lost 192 citizens in the crash, said his top priority now is to get the refrigerated box cars loaded with the bodies to a Ukraine-controlled region.

Organization for Security and Cooperation spokesman Michael Bociurkiw said Ukraine-based investigators' reports suggest some of the bodies were burned without a trace. Alexander Borodai, the leader of the rebels, denied they were tampering with the evidence and said they would turn over the bodies and the plane's "black boxes" to an incoming group of Malaysian experts.

Lyubov Kudryavets, a morgue worker at Torez, said a resident brought him the body of a child on the night of the crash. On Saturday, militants took the body away and questioned her about the location of the "rocket fragments."

Even if investigating teams do get access to the site right away, experts say it might already be too late because the place is already compromised because the rebels already removed some parts of the aircraft. Investigators need to reconstruct the fuselage and wings to determine what kind of missile struck the plane and how it happened.

According to Rutte, the Dutch foreign minister is headed to the UN to boost international efforts for the "quick recovery" of the victims' bodies and for a deeper investigation into the MH-17 disaster.