EU commissioner Guenther Oettinger used a private plane offered by a German businessman with strong Kremlin ties, raising questions whether he broke ethics rules.
He flew from Brussels to Budapest on 18 May, with Klaus Mangold, an honorary Russian consul in Germany, who advocates lifting EU sanctions on Russia.
He went to the Hungarian capital on the invitation of prime minister Viktor Orban for a conference on "the car of the future".
News of his trip first emerged in June ...
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