Kammala wannan jumlar: Bayan mamayar Soviet na Lithuania a watan Yunin 1940, Alantas ya gudu zuwa Jamus. Matarsa da ɗansa sun kasance a Lithuania kuma an tura su zuwa Siberia a lokacin
An kore shi a watan Yuni na shekara ta 1941. A Jamus, an gayyace shi ya shugabanci Hukumar Al'adu ta Lithuanian Activist Front, wani motsi na 'yan gudun hijirar Lithuania da suka nemi' yanci Lithuania tare da goyon bayan Nazi Jamus. Alantas ya kasance na bangaren dama na LAF kuma ya goyi bayan kafa kungiyar. Duk da cewa an ba shi damar jagorantar Hukumar Al'adu a Ma'aikatar Ilimi a Gwamnatin wucin gadi ta Lithuania, Jam'iyyar 'Yan kishin kasa ta Lithuania ta toshe nadin nasa kuma an nada shi a matsayin shugaban gidan wasan kwaikwayo na Vilnius a maimakon haka. A cikin shekaru uku na aiki, Alantas ya rubuta wasan kwaikwayo uku, biyu daga cikinsu an shirya su. A cikin 1944, Alantas ya gudu zuwa Jamus daga sojojin Soviet da ke gabatowa kuma ya zama ɗan gudun hijira bayan Yaƙin Duniya na II. A shekara ta 1949, Alantas ya koma Detroit, Amurka, inda ya yi aiki a matsayin ma'aikaci mai karamin albashi a masana'antar kera motoci ta Ford Motors har zuwa lokacin da ya yi ritaya a shekara ta 1968. Ya san Faransanci da Jamusanci, amma ya yi fama da Turanci. Ya sadaukar da sauran rayuwarsa ga aikin adabi kuma ya wallafa litattafai da yawa, gajerun labaru, da tarin shayari. Ya kasance shugaban kungiyar a cikin 1967-1971, kuma an ba shi aikin gyara littattafan Lithuanian amma ya ƙi.