As his collaboration with NKVD proved not to be satisfactory, Mironas was arrested yet again in 1947 and subsequently sent to Vladimir Prison, where he died in 1953.
Karena kolaborasinya dengan NKVD tak sejalan, Mironas ditangkap algi pada 1947 dan kemudian dikirim ke Penjara Vladimir, dimana ia meninggal pada 1953.