Russia's northern NATO neighbours are tightening security around dams, power plants and natural gas infrastructure in a sign of mounting concern that Moscow will stage a "false flag" attack on them using Ukrainian drones.

Axar.az informs, citing Reuters, that Lithuania said last ​week that Moscow is considering such a staged attack and Poland, Latvia and Estonia have also warned of acts of sabotage to test NATO's response at a time when U.S. commitment to the Western military ‌alliance is in question.

Kremlin spokesman Dmitry Peskov last month said warnings of Russian clandestine attacks are "scare stories" used to justify militarization against Russia.

Poland and the three Baltic states, which all border Russia and have already found Ukrainian drones on their territory, are taking no chances.

"We are not naive, we see the information, we read between the lines and we are doing our homework," Lithuanian Defence Minister Robertas Kaunas told Reuters.

He, the prime minister of Latvia and four intelligence and company officials from across the region shared new details of intelligence assessments ​with Reuters and described measures that are being taken to protect infrastructure in response.

"We are increasing the security of our critical infrastructure, we constantly exchange information with our intelligence on what to do next," ​Kaunas said.