The reason Lithuania has tried to cut off Kaliningrad is because they are trying to provoke an attack by Russia on a NATO ally so they have a just cause to attack Russia. They are using Lithuania as bait.
Russia is not stupid, the goal is a surprise attack. They are not going to fall for this idiotic ploy. Shutting down supplies to Kaliningrad is an act of war, a just cause for retaliation and a direct violation of the peace treaty. This is not something that "Lithuania" did but rather something that NATO did and that includes the US. Russia is one tenth the size of NATO, but Kaliningrad is one of the most strategically important cities to Russia, it is of vital national interest. If Mexico laid siege to San Diego it would be analogous and yet San Diego is not as vital to the US as Kaliningrad is to Russia.
So of course this will not stand.
The US and NATO have been provoking Russia. We sent Kamala over there to encourage Ukraine to join NATO, we have supplied weapons and other aid to Ukraine using them as a proxy to fight Russia, and now we do this, an extremely provocative action.