I think you understand that you are talking only from one side. Lithuania existed way before USSR. And USSR Only occupied LT, LV and EE by force.
I am not sure what do you know about Lithuania and Lithuanian history but if you do know something so you should know that the first known record of the name of Lithuania is in a 9 March 1009 story of Saint Bruno and it is way before your USSR story.
RE: The USSR is alive