Faulty premise (Equivocation Fallacy) in very first sentence! FAIL!
Not allowing someone to traipse through your living room can hardly be called a "blockade!"
As a sovereign state, Lithuania is fully within its rights to prohibit the transit of select Russian goods across its territory.
Regards,
Lithuania’s independence was recognized by Russia in 1993, under the condition of the signing of a treaty guaranteeing uninterrupted transit for its goods between the main part of Russia and Kaliningrad.
See the treaty that Lithuania signed here on the UN website:
https://treaties.un.org/doc/Publication/UNTS/Volume%201831/volume-1831-I-31342-English.pdf