Lithuania on Monday handed a diplomatic note to Russia over a large amount of paraffin wax found in the Curonian Spit in late January.
Vilnius also handed its response to a note it received from Moscow in mid-January over the release of untreated wastewater into the Curonian Lagoon by Grigeo's cardboard factory.
Read more: Wax-like substance found on Lithuanian beaches traced to Russia
"In the first note, we ask Russia for information as to what production facilities in their area could have illegally discharged a large amount of paraffin that has reached our shores," Deputy Environment Minister Justina Grigaravičienė told BNS in a comment.
"By the second note, we responded to [Russia's] inquiry regarding Grigeo Klaipėda [to inform them that] the pollution of the Curonian Lagoon has been stopped," she said.
Pieces of a substance similar to paraffin wax were first spotted on Lithuania's beaches on January 23. Environmental officials said the waste had apparently come from Russia's Baltic Sea exclave of Kaliningrad.
The Curonian Spit municipality of Neringa and the local national park authority, helped by volunteers, have collected around 20 cubic meters of the waste.