"This is a report that has to show why Lithuania is so consistently, unthinkingly pursuing such a strong anti-Russian policy," Alexander Udaltsov said in Vilnius on Monday.
He spoke to reporters after the Lithuanian State Security Department and the Second Investigations Department under the Defence Ministry released their annual report on threats to national security, identifying Russia's aggressive intentions and actions as the number one threat to national security.
The ambassador said that such reports are aimed at intimidating people and justifying requests for greater NATO presence in the Baltic Sea region.
"One of their main tasks is to scare people living here, Russian-speakers, by saying that if you look at things differently than we do, you'll have to answer for that," he said.
Udaltsov also said that intelligence agencies persecute Russian compatriots in Lithuania.
According to the ambassador, such people have to give explanations to the State Security Department about what they did during meetings at the Russian embassy and what assignments they allegedly received.
"In a word, this is all sad," he said.
This year's report says that Russia will try to influence next year's presidential election in Lithuania and warns against possible cyber-attacks.
The report says that Russian intelligence bodies still use classified information available in Russia's archives about former KGB agents in Lithuania for recruiting Lithuanian nationals.
It says Russian intelligence aims to track down and discredit former secret collaborators of Soviet secret services who have not come forward with their KGB past and currently work in Lithuania's state institutions.
However, this year's report pays less attention to national minorities and makes no mention of some ethnic Poles in the Vilnius region allegedly collaborating with the Russian embassy.