The Kremlin said that an allegation by Polish Prime Minister Donald Tusk that Russia had planned "acts of terrorism" in the air against Poland and other countries was completely unsubstantiated.
Mr Tusk made the assertion yesterday after meeting Ukrainian President Volodymyr Zelensky in Warsaw, apparently referring to parcels which exploded at logistics depots in Europe, which Western security officials suggested were part of a test run for a Russian plot to trigger explosions on cargo flights to the United States.
EU and NATO member Poland has been one of Ukraine's biggest allies since Russia launched a war against Kyiv in February 2022.
"Poland plays a key role in Europe in countering the acts of sabotage and diversion that Russia is organising, and not just on Polish territory," Mr Tusk told reporters.
He said some of the acts were "very dramatic".
"All I can say, and I will not go into details, but I can confirm the validity of these fears, is that Russia had planned acts of air terror, and not only against Poland, but against airlines all over the world," he added.
"These are absolutely unsubstantiated allegations against Russia," Kremlin spokesperson Dmitry Peskov told reporters when asked about Mr Tusk's statement.
"Poland is well known for making such accusations."
In November, Lithuania carried out arrests as part of a criminal probe into sending incendiary devices on Western-bound planes.
According to Polish and Lithuanian media, the devices, including electric massagers implanted with a flammable substance, were sent from Lithuania to Britain in July and could be behind a lorry fire outside Warsaw.
The Lithuanian president's chief security advisor said Moscow was behind the incidents.
UK anti-terrorism police in October said they were investigating how a parcel burst into flames at a depot earlier this year after a similar case in Germany blamed on Russia.
