The Russian Foreign Ministry said Thursday it had summoned the ambassadors of Germany, Sweden, and Denmark to protest what it described as a “complete lack of results” over the investigations into the ruptured Nord Stream 1 and 2 gas pipelines.

The twin Nord Stream natural gas pipelines linking Russia to Germany were hit by four undersea blasts in September. Western leaders have all described the blasts as an act of “sabotage,” though no one has said who was responsible for carrying out the explosions.

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In a statement Thursday, Russia’s Foreign Ministry accused all three countries of deliberately moving slowly in the investigations in an effort to conceal who was responsible for the blasts.

"It has been noted that these countries are not interested in establishing the true circumstances of this sabotage. On the contrary, they are delaying their efforts and trying to conceal the tracks and the true perpetrators of the crime behind which we believe are well-known countries," Russia’s Foreign Ministry said in the statement.

"It is no coincidence that 'leaked' improbable versions [of what happened] are dumped in the media to try to muddy the waters," it said.

Swedish, Danish, and German authorities have each been separately investigating the Nord Stream explosions, which were carried out in Sweden and Denmark's exclusive economic zones. All investigations are underway.

Danish and Swedish authorities have each rejected Russia’s request to join its investigation or share classified information with Moscow, prompting Russia to lash out earlier this year and suggest they might have “something to hide.”

Russia has repeatedly attempted to blame the West for shielding information, and Kremlin officials complained to the United Nations in March about the lack of information shared by the countries tasked with investigating the blasts.

Thursday's complaint also follows a long string of finger-pointing and unofficial suggestions as to who might be behind the Nord Stream explosions.

Kremlin officials have blamed "Anglo-Saxons" for carrying out the attacks, and Russia also suggested without evidence earlier this year that the United States or the United Kingdom could be behind the attacks.

Meanwhile, in March, the New York Times reported that a pro-Ukrainian group of either Ukrainian or Russian nationals had exploded the Nord Stream 1 and 2 gas pipelines, citing intelligence reviewed by U.S. officials.

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The intelligence reviewed suggested that the group opposed Russian President Vladimir Putin, but did not specify members of the group or say who had directed or paid for the operation.

Ukraine, for its part, swiftly denied any involvement in the explosions.