USSR. OKB-1 150
The OKB-1 150 ( improperly named Alekseev 150 ) was a strategic jet bomber developed in the USSR by the OKB-1, which includes German engineers that had worked on the successors of the jet bomber Junkers Ju 287 (EF-132, EF-140). The OKB-1 150 was successfully tested in 1951, but was damaged after a crash landing after engine failure. The USSR also preferred the Tupolev Tu-15. The second prototype was abandoned, but the OKB-1 team, led by Dr. Baade, returned to the German Democratic Republic, where they designed the Dresden (Baade) 152 jet liner.
The photos of the only prototype show that it didn't have any marks or emblems.