 Nyora kupfuurira kweiyi ndima - Muna November 1939, Merkys akava Mutungamiriri weHurumende. Raštikis akasiya basa muna Ndira 1940 uye akatsiviwa naVitkauskas. Apo Soviet Union yakapa ultimatum musi wa 14 June, Vitkauskas akataura achirwisana nokurwisana nezvombo. Chiziviso chokupedzisira chakagamuchirwa uye Lithuania yakarasikirwa norusununguko rwayo. Vitkauskas akashanda pamwe nehurumende itsva achiva Gurukota reDziviriro muHurumende yeVanhu, nhume yakasarudzwa yePeoples Seimas, uye nhengo yedare rakapa Joseph Stalin chikumbiro cheLithuania kuti ave imwe yenyika dzeSoviet Union. Mauto eLithuania akarongwazve kuva 29th Rifle Corps yeRed Army yaitungamirirwa naVitkauskas. Muna June 1941, pamberi chaipo pokupinda kweGermany muRussia, Vitkauskas akatumirwa kuMilitary Academy yeGeneral Staff muMoscow kwaakadzidza ndokuzodzidzisa kusvikira kutanga kwa1946. Akadzokera kuLithuania ndokudzidzisa paYunivhesiti yeKaunas uye Kaunas Polytechnic Institute kusvika pamudyandigere muna 1954. 