Parts of the Ukrainian government authorised a car bomb which killed the daughter of a key ally of Vladimir Putin in Moscow, the US believes.
Kyiv has always denied responsibility for the attack of Darya Dugina, the daughter of a prominent Russian nationalist, in August.
But US intelligence agencies have now concluded that the explosion was sanctioned by parts of the Ukrainian government in a closely held assessment shared within the US government last week, according to the New York Times.
US officials insisted Washington had no advance knowledge of the attack, nor did it provide intelligence or other assistance that led to it, according to the paper.
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In fact, American officials admonished their Ukrainian counterparts in the wake of the assassination.
It is unclear if Ukrainian president Volodymyr Zelensky had signed off on the attack or who in the Ukrainian government America rebuked over the incident.
Read more: Telegraph