Yulia Miroshnikova, the spouse of Stanislav Yezhov, assistant to the Ukraine's prime minister, has called the arrest of her husband nonsense.
Special Security Service of Ukraine (SBU) detained a high-ranking government official on suspicion of espionage for Russian Federation, the agency's press service reported on December 20.
Ukraine's Prime Minister Volodymyr Groysman posted about the arrest on his Facebook page.
Mr Yezhov, 39, had travelled on numerous foreign trips with Mr Groysman as an official in the cabinet of ministers.
A statement posted on the SBU website [in Ukrainian] said: "Law enforcers found that an official was recruited by Russian intelligence agencies during a long-time foreign mission".
Mr Yezhov accompanied Ukrainian PM Volodymyr Groysman on a visit to London in July and was photographed with his boss and Mrs May in Number 10.
It supplied him with "special equipment" which was used to collect information about the "activities of [Ukrainian] government structures".
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The meeting that Mr Yezhov attended to translate involved discussions on "the importance of maintaining sanctions on Russian Federation to keep up political pressure until the full implementation of the Minsk Agreement" and "the importance of improving the capability of the Ukrainian armed forces", Downing Street said.
'He was respected. And he responsibly and diligently worked for the Russian special services'.
Yezhov allegedly sent data back to his Moscow handles via electronic communication channels.
The SBU said in a statement that the official was recruited by Russian agents while he travelled overseas.
The man worked in Ukraine's cabinet of ministers where he would have had access to sensitive government information, as well as attending high-level meetings including with Theresa May and former US Vice President Joe Biden.
'The Kremlin is seeking to undermine the global rules-based system and it will not succeed'.
'We can neither confirm or deny the allegations against him.