Russia’s investment firm, Digital Sky Technologies (DST), invested US$500 million in 360buy, China’s leading online retailer, said 360buy’s CEO Liu Qiangdong.  360buy is raising over US$1 billion in its series C of funding.

Liu said 360buy will be going public in 2013 or later, in either U.S. or Hong Kong.

DST was found by Russian billionaire, Yuri Milner, in 2005.  It has invested in Facebook, Groupon and Zynga.

Funny enough, Tencent invested US$300 million in DST and has 10.26% of its stake.  That means a Chinese internet company invested into another Chinese internet company using a Russian Fund.  Why Tencent does not invest in 360buy directly ??