Norwegian and Italian fighter jets patrol the Baltics during a NATO air-policing mission, from an air base in Lithuania, in May 2015. Ints Kalnins/REUTERS

Signs of an intensifying Moscow-led information campaign have the Lithuanian government worried that Russia is laying the groundwork for "kinetic operations" — a euphemism for combat — similar to its recent actions in Crimea and eastern Ukraine.

Lithuania's defense minister and military communications officials told The Guardian that they were "taking very seriously" Russia-organized propaganda efforts to undermine stability in the Baltics, which consist of Lithuania and its northern neighbors, Latvia and Estonia.

"Russia is a threat," Lithuanian Defense Minister Raimundas Karoblis told The Guardian. "They are saying our capital Vilnius should not belong to Lithuania because between the first and second world wars it was occupied by Poland."

"There are now reports that Klaipeda never belonged to Lithuania, that it was a gift of Stalin after the second world war," Karoblis said. Klaipeda is Lithuania's third-largest city.

"There are real parallels with Crimea's annexation [from Ukraine] ... We are speaking of a danger to the territorial integrity of Lithuania," Karoblis added.

Lithuanian officials said attempts to dispute or alter history could be a prelude to offensive action, similar to more than a decade of such disinformation efforts in Ukraine that led to Russia's annexation of the Crimean peninsula.

Russian President Vladimir Putin attends military exercises at a firing ground in Kirillovsky, Russia, in 2014. RIA Novosti/Reuters

Prominent Russian politicians have challenged Lithuania's right to exist, and television and social-media campaigns have charged that Vilnius is mistreating ethnic Russians or laid claim to parts of Lithuania, which does not border Russia but abuts Kaliningrad, a Russian semi-exclave on the Baltic Sea.

Russian President Vladimir Putin has suggested or justified Russian action in the past on the basis of defending Russian speakers abroad, which some of those groups have embraced.

The Lithuanian military's strategic-communications department has noticed the creation of Facebook pages for "statelets" in the Baltics — another development reminiscent of the conflict in eastern Ukraine.

Recent developments in Russian military capabilities have given more weight to fears over looming kinetic actions.

Uniformed men, believed to be Russian servicemen, stand guard outside a Ukrainian military base in the village of Perevalnoye, in March 2014. REUTERS/Vasily Fedosenko

Lithuania's intelligence service said in its annual threat assessment that Moscow last year upgraded its military in Kaliningrad, reducing lead times for any attack and potentially preventing NATO reinforcements. Vilnius said Moscow was able to launch an attack on the Baltics with as little as 24 hours' notice.

Russia has recently deployed nuclear-capable missiles to Kaliningrad, which prompted protests from Lithuania. Moscow is making its biggest push into the Arctic and running its submarine force at the highest operational tempo since the fall of the Soviet Union.

"This is a signal to NATO to improve its decision speed," Lithuanian Defense Minister Raimundas Karoblis told reporters during the presentation of the report. "NATO's reaction time is not as fast as we would like it to be."

Lithuanian soldiers and US Marines from the Black Sea Rotational Force engaged opposition forces in a partnered attack during Exercise Saber Strike at the Pabrade Training Area, Lithuania, in June 2015. US Marine Corps/Sgt. Paul Peterson

Moscow, for its part, denounced recent reports about its capabilities in the Baltics as "total Russophobia," but other NATO members and neighboring countries have been stepping up their military activities in Eastern Europe, which is already bristling with offensive and defensive weaponry.

Germany is to lead a contingent of 1,000 troops from NATO states to Lithuania. Battle groups led by the UK and Canada will also take up positions in Latvia and Estonia.

More than 1,100 troops — 900 of them from the US — recently took up position in Poland, which plans to buy $7.6 billion worth of Patriot air-defense missiles to counter Moscow, in a move that was greeted with Russian ire.

US soldiers in Zagan, Poland, January 12, 2017, as part of NATO deployment. REUTERS/Zbigniew Janicki/Agencja Gazeta

"This is a mission, not a cycle of training events," said US Army Lt. Col. Steven Gventer, who heads the battle group in Poland. "The purpose is to deter aggression in the Baltics and in Poland ... We are fully ready to be lethal."

Finland, which is not a NATO member but has a long, bloody history with its Russian neighbor, is beefing up its military force as well.

The US has deployed dozens of helicopters and thousands of pieces of military equipment to Germany in recent weeks to underscore Washington's "rock-solid commitment to Europe."

French jets have also shadowed Russian fighters in the skies above the Baltics, identifying and observing Russian planes in international airspace along NATO's northern border.

German Chancellor Angela Merkel and President Trump at the White House, March 17, 2017. REUTERS/Joshua Roberts

Heightened tensions between NATO and Russia in Europe come as relations between the military bloc and the US have become more contentious with the arrival of President Donald Trump.

Trump and other US officials have emphasized that NATO countries need to step up their defense spending or risk US pullback from the alliance.

At least one NATO member — Estonia — which sits at the northern edge of the Baltics, has thrown in with Trump on the issue of NATO commitments.

"There is the legitimate expectation of the Americans that the Europeans spend more money on defence," Estonian President Kersti Kaljulaid told Die Welt in mid-February.