Three Ukrainians who aided the Donald Trump campaign’s efforts to discredit the Biden family have been charged with treason.
The 2019 drive was led by former New York Mayor Rudy Giuliani, who was Mr Trump’s personal lawyer at the time.
It centred on unproven allegations that Joe Biden had corrupt dealings with Ukraine as vice-president.
Ukraine’s Security Service (SBU) said the three men charged were paid by Russian military intelligence (GRU).
It added that they had used a “tense political situation” to harm Ukraine’s reputation abroad.
The three men charged are understood to be current MP Oleksandr Dubinsky, former lawmaker Andriy Derkach and ex-prosecutor Kostyantyn Kulyk.
Mr Dubinsky has denied the charges.
All three are said to be members of an agent network led by Russian Gen Vladimir Alekseyev, the deputy head of the GRU.