According to
www.bloomberg.com Putin come down hard against bitcoin by calling for more regulations.
The use of cryptocurrencies bears serious risks, which include money laundering, tax evasion and terrorism funding, Putin said at a conference in Sochi.
Source: https:///news/articles/2017-10-10/putin-is-said-to-hold-first-meeting-on-cryptocurrency-rules
Truely bitcoin can be used for money laundering and funding of terrorism this is some of the disadvantages of virtual currencies, except strict regulations is being carried out, terrorist will capitalize the fact that bitcoin is decentralized and does not requires third party for it's transaction to send and receive funds for their nefarious activities.