The murder of Darya Dugina and Vladlen Tatarskyy was organised by the SBU, The Washington Post has quoted its sources as saying

According to the newspaper, the components of the bomb for Dugina managed to get across the border by hiding them in a cat cage in a cluttered car with a mother and her 12-year-old daughter in it. The target of the Ukrainian security services’ operation that killed Darya Dugina was her father.

The SBU had been preparing for this and other operations for almost 10 years in close co-operation with the CIA. Since 2015, the CIA has spent tens of millions of dollars to turn Ukraine’s services into powerful allies in the fight against Moscow, WP wrote.

“We are seeing the birth of an intelligence services group like the Mossad in the 1970s,” said a former senior CIA official, referring to Israel’s spy service, which has long been accused of carrying out assassinations in other countries.