@aaq
WW2 started september 1939 with germany and then soviet russia attacking poland
mir , in eastern poland was conquered by the soviets
the yeshiva fled mir which was under soviet occupation towards vilna in october 1939 after receiving a clear psak [!] from rav ch’o that they should even be mehalel shabat to do so
rch’o took the initiative to send telegrams to the yeshivot under soviet occupation at the time
vilna was also under soviet occupation at the time
but r’ch’o was told that vilna would be handed over to the then still free and neutral Lithuanian government
which actually happened a few weeks after the yeshivot arrived in vilna
the question of yeshivat mir fleeing from vilna to the far east came up later , after the soviet occupation of free lithuania in the summer of 1940
that was during the period lithuania was occupied by the soviets for the period around one year between the soviet invasion during the summer 1940 and the nazi invasion during june 1941
during that year the yeshiva was grappling with the question about applying to the soviets for exit visas
and that was after r’ch’o was niftar already
at no point was there any ‘psak’ from anyone either way , re the advisability of filing requests to exit the communist ‘paradise’ .
.