Russian Central Bank head criticizes oil giant's bond placement

"I think that, indeed, the Rosneft deal was non-transparent, unclear to the market and was an additional factor of volatility in the market. However, it was not the main one," Nabiullina said in interview with Forbes.

In December 2014 Rosneft placed 14 issues of bonds worth R625bn in total. The deal became a record-breaker in terms of size in the Russian debt market.