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Their intelligence report says Moscow could prepare for wider conflict within years.
The country has launched a public procurement process to acquire modular bunkers.
The European Commission recently warned that the situation was "worsening," calling the balloon incursions a "hybrid attack."
The airport has been forced to close more than ten times since early October.
Belarus on Monday accused Lithuania of using a drone to conduct surveillance and drop "extremist material".
The report highlights a worrying shift in Europe, where Estonia, Finland, Latvia, Lithuania, and Poland are all moving to exit the Ottawa Convention.
Vilnius Airport alone has been forced to close at least 10 times since early October.
Lithuania blames Belarus for repeated airspace disruptions.
Closure ends following airspace disruptions caused by balloons blamed on Belarus.
Authorities confirm it turned out to be a civilian drone.
This is the fourth such incident this week.
A SU-30 fighter jet and an IL-78 tanker entered Lithuania's airspace from Kaliningrad at around 6:00 p.m. local time.
The border could close again if incidents with smuggler balloons persist.
Estonia, Latvia, and Lithuania coordinate civil defense measures as fears of a possible Russian offensive grow.
Flights at Lithuania's main airport are back on schedule following an unusual airspace alert.
Temporary controls extended to monitor migration flows across northern borders.
At least 10 European countries have reported suspicious drones in their airspace over the past three months.
Schools in Lithuania are teaching children and adults to operate drones as part of national defence education.
Warsaw's move reflects growing regional tensions over illegal crossings and diverging approaches to Schengen rules.
The move follows growing domestic pressure over migration and mirrors similar measures across the EU.
The €1 billion project aims to strengthen NATO's eastern defences with new barriers and surveillance systems.
Northern alliance eyes joint CV90 purchase in strategic defence push.
Amid heightened tensions in Eastern Europe, Lithuania aims to bolster its defence industry while attracting foreign investments.
Estonia, Latvia, and Lithuania brace for potential retaliation as they join the European Union's electricity network.