Yulia Tymoshenko, the Ukrainian prime minister who is keen to clean up the murky natural gas trade between her country, Russia and central Asia, on Monday said Moscow’s arrest of a reputed crime boss was a sign that the days were numbered for ”corrupt” intermediaries.

Ms Tymoshenko was referring to the arrest of the 61-year old mobster Semyon Mogilevich, who has alleged links to Swiss-registered RosUkrEnergo, a company half owned by Gazprom and 50 per cent controlled by two Ukrainian businessmen.