Lithuanian authorities said a ban on the transit through their territory to the Russian exclave of Kaliningrad of goods that are subject to EU sanctions was to take effect from Saturday.

https://news.yahoo.com/lithuania-says-sanctions-goods-kaliningrad-132105641.html

European Commission approved Lithuania blockade of Russia’s Kaliningrad

https://alethonews.com/2022/06/20/european-commission-approved-lithuania-blockade-of-russias-kaliningrad/

LITHUANIA and RUSSIAN FEDERATION Agreement concerning international road transport (with protocols). Signed at Vilnius on 18 November 1993

https://treaties.un.org/doc/Publication/UNTS/Volume%201831/volume-1831-I-31342-English.pdf

Russia Demands Lithuania Lift "Openly Hostile" Blockade

https://www.zerohedge.com/geopolitical/eu-just-implemented-risky-anti-russia-measure-could-trigger-ww3-few-are-taking-notice