BMW R-71 (Germany) ➤ Dnepr M-72 (USSR) ➤ Chang-Jiang 750 (CHINA)

BMW R-71 (Germany). 1938 (WIKI)

Dnepr M-72 (USSR).  1956 (WIKI)

The official version reads that, after long discussion and debate, the BMW R71 motorcycle was decided to most closely match the Red Army’s requirements. Five units were covertly purchased through intermediaries in neutral Sweden and smuggled to Russia. Soviet engineers in Moscow busily dismantled the 5 BMWs. They copied every detail of the BMW design and made moulds and dies to produce their own engines and gearboxes in Moscow. Everything about the bike was reverse engineered. Early in 1941, the first trial samples of M-72 motorcycles were shown to Stalin, who immediately approved production of the motorcycles.
— www.ural.cc

Chang-Jiang 750 (CHINA). late 1950s or early 1960s (WIKI

The CJ750 motorcycle is based on the original 1956 Soviet IMZ (Irbitski Mototsikletniy Zavod) M-72 which itself was derived from the earlier German 1938 BMW R71. Nearly all of them have sidecars. They are often erroneously referred to as BMW “replicas” when in fact, they are derivatives of the IMZ M-72.
— Wikipedia