"We try to be sure and will continue trying to be sure that all the facts are studied and all the versions are considered. And we will be doing this in order not to make one of these versions win, but to establish the truth. This is the most important."
"Unfortunately, there is an impression being created that some of our partners are interested in the opposite. If it is not going to be possible to prove their version of the truth, which they put forward only a few days after the catastrophe, then they want to drag out the investigation, or maybe even to completely put a stop to it."
Russian Foreign Minister Sergey Lavrov has accused Washington of welcoming actions that he says undermine the Minsk agreement with Ukraine.
Lavrov was speaking to reporters in Moscow after a meeting with his Iraqi counterpart, Ibrahim al-Jaafari.
Lavrov was referring to a telephone call between the Ukrainian President Petro Poroshenko and the U.S.Vice President Joe Biden, during which U.S.assistance in training Ukrainian forces was reportedly discussed.
Lavrov also spoke about the investigation of the downing of airliner MH17 over eastern Ukraine, claiming that some parties were not interested in establishing the truth.
MH17 was shot down over territory held by pro-Russia rebels in July, killing all 298 people aboard, mostly Dutch citizens.
"If it is not going to be possible to prove their version of the truth, which they put forward only a few days after the catastrophe, then they want to drag out the investigation, or maybe even to completely put a stop to it."
Commenting on his talks with the Iraqi Foreign Minister, Lavrov said that they discussed economic cooperation, various regional problems and fight against the Islamic State Group.