>>4937623"In their letters and other records, the Sino-Soviet relationship was revealed to be far from the fraternal one described in official accounts; Chinese students learning revolution fell in love with Russians or with each other, married or lived together, sometimes in unconventional combinations, and produced children, whether in or out of wedlock."
http://www.scmp.com/magazines/post-magazine/long-reads/article/2130584/how-chinese-communists-fell-love-russians-and 