The Slavic nation took the bold step of erecting a physical barrier, akin to Donald Trump’s fabled wall, as it fears growing aggression from Moscow.
Lithuania, a former Soviet nation, borders Kaliningrad, Russia’s enclave in the heart of Europe.
Sandwiched between Poland on the other side, the outpost is some 800 miles from the Russian capital.
Tensions have been on a knife edge in the region since Russia annexed Crimea in 2014, and ignited a civil war in Ukraine.
Eastern European nations have pleaded for more support and backing from NATO, as it fears the looming shadow of Russia approaching ever closer.
And with Moscow due to kickstart its mammoth military exercise in a few weeks, Zapad, Lithuania is taking action.
Zapad is estimated to involve some 10,000 troops on the EU’s border, and has raised fears of a strike by Russian forces.
In response, Lithuania is beefing up security along the 27 mile-long Ramoniškiai crossing.
The Government is building a £3.2million two-metre high border fence either side of the crossing.
Lithuania’s minister of the interior, Eimutis Misiūna, explained the Ramoniškiai fence was more to combat illegal alcohol and tobacco smuggling, but there are ulterior motives.
He said: “I have a second reason, everybody knows.
“Estonia accused Russia of abducting an intelligence officer and we in Lithuania don’t want this to happen with Lithuanian officers. It is like a red line for Russia.”
But the fence is thought to be more symbolic against Vladimir Putin’s hegemony in the region.
Mr Misiūnas added: “We don’t fight with Russia, we don’t want to fight with Russia.
“We have this neighbour, we know how to live with this neighbour, and we live.”