A new report conducted by the Dutch Safety Board has determined that Malaysia Airlines Flight 17, which crashed in 2014 and resulted in the deaths of all 298 people on board, went down because a Russian-made Buk missile exploded outside the left side of the airplane's cockpit.

In a video that illustrates the new findings, the chairman of the Dutch Safety Board, Tjibbe Joustra, explained, “Because of the large number of Dutch victims, we naturally wish to contribute to the investigation in the causes of the crash of the crash.”

The report, which was the result of a 15-month-long investigation, was able to determine that Flight 17 was shot down by a sophisticated surface-to-air missile, but was unable to precisely locate the missile's origin.

As CBS reports, Joustra announced, "Flight 17 crashed as the result of the detonation of a warhead outside the airplane," and that after the explosion, "the forward part of the plane was torn off."

The Unites States, along with Ukraine, has maintained that either Russian-supported separatists or the Russians themselves were responsible for the downed plane. Russia has placed blame on the Ukrainian military.

Regarding the recent Dutch report, Russian Deputy Foreign Minister Sergei Ryabkov called the investigation biased.

"It's a source of regret that, despite all Russia's repeated and lengthy attempts to organize the investigation in such a way that it is comprehensive and unbiased, and for it to consider all the information we have ... there is an obvious attempt to draw a biased conclusion, and carry out political orders," Ryabkov said, according to Reuters.

Philip Hammond, the U.K.’s secretary of state for foreign and commonwealth affairs, took to Twitter to commend the work of the Dutch Safety Board, writing, “Those responsible must be held to account.”

Watch the Dutch Safety Board's simulation of what happened: