The sentence came after being convicted of 14 counts of attempted insurance fraud.
The naval exercise in the Baltic Sea involves 40 vessels, 25 fighter jets, and over 3,500 soldiers.
The Polish company, Pern, said it sees no reason to suspect sabotage of the Druzhba pipeline.
The Nord Stream 1 and 2 pipelines were ruptured by powerful underwater explosions in September.
The European Union believes sabotage is likely the cause of leaks from the Nord Stream I and II gas pipelines.
Russia is insinuating that it will use nuclear weapons against Kyiv if Ukraine attempts to retake annexed Ukrainian regions.
Lithuania said Russia’s threats were nothing new and that it had deployed nuclear weapons to Kaliningrad long before the war in Ukraine.
