The increase in expenditure is intended to enable the NATO country Lithuania to "block and slow down hostile states' actions", according to the Ministry of Defence.
Among other things, 800 million euros will be spent on anti-tank mines.
As part of the planned measures, the country will store anti-tank defence systems and other fortifications near the so-called Suwalki Corridor – a 70-kilometer-long strip of land between Poland and Lithuania that connects Belarus with the Kaliningrad exclave.
Lithuania also plans to deepen ditches that can serve as trenches and reforest border regions.
In January, Lithuania announced that it plans to spend between five to six per cent of GDP on defence between 2026 and 2030.
Lithuania and the other Baltic states Latvia and Estonia – all of which border Russia – fear that they may become the next target if Russia wins the war against Ukraine.