Secretary of State John Kerry opened up about the overwhelming evidence pointing to Russia's involvement in the Malaysia Airlines Flight 17 crash last week and called on the European Union to put pressure on Russia and hold the country accountable.

On Wednesday, passenger plane MH17 was carrying 298 people from 11 different countries when it was shot down from the sky by missiles and landed in the eastern Ukrainian region of Donetsk Ukraine, an area controlled by pro-Russia separatists. Both the U.S. and Ukrainian government accuse rebels backed by the Russian government of firing the missile. However, Russia denies that it had any involvement in the crash or that it provided the rebels with sophisticated missile systems.

While making rounds on Sunday morning news shows, Kerry demanded Russia to take responsibility for the actions of the pro-Russian separatists suspected of shooting down MH17. He called on Russian President Vladimir Putin to hold the separatists responsible and grant access to the crash site.

"It is clear that Russia supports the separatists, supplies the separatists, encourages the separatists, trains the separatists. And Russia needs to step up and make a difference here," Kerry said on NBC's "Meet the Press," according to The Telegraph.

He went on about how rebels are restricting the access of foreign investigators at the crash site and making it hard for experts to conduct a transparent investigation. He also expressed disgust over the rebels' "grotesque" mishandling of victims' bodies at the crash site.

"Drunken separatists have been piling bodies into trucks and removing them from the site ... What's happening is really grotesque and it is contrary to everything President Putin and Russia said they would do," said Kerry, reports Yahoo! News.

Kerry also called on the European Union to become assertive, saying, "It would help enormously if some countries in Europe that have been a little reluctant to move would now recognize this wake-up call and join the United States and President Obama in taking the lead, and also stepping up," he said.

According to Kerry, an official unclassified U.S. intelligence summary released over the weekend has confirmed the authenticity of a recording of a known separatist leader bragging about shooting the plane.

"We also have information indicating that Russia is providing training to separatist fighters at a facility in southwest Russia" that includes missile systems, it said.