BBC News reports the United States has imposed sanctions on 14 Ukrainian separatists and Russians, including an idealogue who has heavily influenced the Kremlin. Political scientist Alexander Dugin is an extreme Russian nationalist closely associated with the Ukraine conflict. The U.S. said it was cutting business ties and freezing the assets of him and others who had destabilised the situation in the east of the country. A ceasefire, albeit not fully observed, has been in place for a month. Russia said it found the new wave of sanctions "difficult to understand." "We categorically do not see any link between what has recently been happening in south-eastern Ukraine and these sorts of actions," Deputy Foreign Minister Sergei Ryabkov told the news agency Interfax.