British defense minister Ben Wallace said an imposter claiming to be the Ukrainian prime minister contacted him on Thursday and asked several “misleading questions.”

“Today an attempt was made by an imposter claiming to be Ukrainian PM to speak with me. He posed several misleading questions and after becoming suspicious I terminated the call,” Wallace said on Twitter.

“No amount of Russian disinformation, distortion and dirty tricks can distract from Russia’s human rights abuses and illegal invasion of Ukraine. A desperate attempt,” he added.

A source at the agency told Reuters that Wallace ordered an immediate investigation into how the incident could have occurred.

In May 2018, Prime Minister Boris Johnson, who was Foreign Secretary at the time, spoke about international relations with a prankster who posed as the prime minister of Armenia.