You have to ask, how could the blockade of Kaliningrad not have unintended consequences? One side thinks one thing is going to happen, and the other side thinks something else entirely is going to happen. From Robert Bridge at strategic-consequences.org:
For the EU to impose even a partial blockade of Russian territory presents a tremendous risk to regional stability and world peace. Some are beginning to talk about the risk of World War III.
Lithuania has blocked a number of rail-transport goods from reaching the Russia exclave of Kaliningrad. Vilnius says it is merely adhering to the EU-mandated sanctions regime, but Moscow warns it has broken international law. Is this a casus belli?
Efforts to punish Russia for defending its territory from encroaching NATO forces, as well as a very real neo-Nazi threat in neighboring Ukraine ratcheted up this week as Vilnius halted the flow of goods into Kaliningrad, the Russian exclave that is bordered by NATO members Poland to the south, Lithuania to the north and east, and the Baltic Sea to the west.
Kaliningrad Governor Anton Alikhanov says the ban affects some 50 percent of all imported goods, including energy resources, metals, construction materials and advanced technology. Official pleas against panic buying went unheeded as frantic shoppers were seen hoarding products.