Turreted bunker have been located on border with China.
Also they were on Kuriles.
Their occurrence in USSR OOB is possible ?
For clearing a place in USSR OOB it is necessary to remove one of available bunkers without turret.
http://www.fortification.ru/oldforum...pic=377&page=1
http://www.vokrugsveta.ru/telegraph/globe/670/