Update (1100ET): The Russian Foreign Ministry has responded to Lithuania's partial blockade of Kaliningrad, writing in a statement that they consider the "provocative measures" to be "openly hostile" and warning that the Kremlin may take action to "protect its national interests."
Kaliningrad is sandwiched between the EU and NATO members Poland and Lithuania. Supplies from Russia are delivered via rail and gas pipelines through Lithuania - which announced last week that it was banning the rail transit of goods subject to EU sanctions, which include coal, advanced technology, metals and construction materials.
"If in the near future cargo transit between the Kaliningrad region and the rest of the territory of the Russian Federation through Lithuania is not restored in full, then Russia reserves the right to take actions to protect its national interests," the statement reads.
They have demanded that Lithuania immediately lift the ban on a number of goods to the Kaliningrad region.