Russia will demand that Ukraine prepay for June natural gas imports, and the first bill will be delivered to Kiev on May 16, Russian Energy Minister Alexander Novak said Thursday. Mr. Novak said the deadline that Ukraine had to settle its gas bill for earlier deliveries expired Wednesday and, according to the contract between Russian gas monopoly Gazprom and its Ukraine counterpart Naftogaz, Ukraine will have to pay for future deliveries in advance. The minister said starting in June Ukraine will receive only the volume of gas it had paid for by the end of May. Ukraine has run up a bill for Russian gas, which Gazprom said has reached $3.5 billion. Naftogaz confirmed earlier Thursday that no payment has been made to cover the debt. On Tuesday, Ukraine received a first installment, $3.19 billion, from a rescue package approved by the International Monetary Fund. Part of the money […]