Newsweek reported that six months after parts of the Nord Stream 6 pipeline were sabotaged, a mysterious cylindrical object was found on the seafloor near the line that likely provides important evidence as to who blew up the pipeline.

It said in a report that Denmark had invited the Russian-controlled pipeline operator to help recover the UFO.

Russian President Vladimir Putin said he believed the object could be a signal antenna to activate an explosive in that part of the pipeline.

The German, Swedish and Danish authorities are investigating the explosion of the line that caused four leaks in the Baltic Sea last September, 4 months after Russia's attack on Ukraine.

The Danish Energy Agency said it was possible that the object was a marine smoke buoy and that it "does not pose an immediate safety hazard".

The magazine quoted the New York Times as saying that U.S. officials saw new intelligence indicating that a "pro-Ukrainian group" was responsible for sabotaging the pipelines, in which Russian energy giant Gazprom has a majority stake.

The Ukrainian government has denied any involvement, while the Kremlin called the New York Times report an "attempt to divert attention."

Nord Stream 1 and 2 pipelines have long been targets of criticism from the United States and some of its allies, who have warned that they pose a threat to Europe's energy security by increasing reliance on Russian gas.

Germany halted certification of Nord Stream 2 after Russia's invasion of Ukraine, and Moscow halted gas flow in the pipeline a week before the attack.