BRUSSELS, Jan. 29 – Prime Minister Yulia Tymoshenko on Tuesday vowed to get rid of RosUkrEnergo, Ukraine’s only supplier of natural gas, before the end of June, or six months sooner than had been previously expected.

The deadline disclosed by Tymoshenko offers a timetable for a major shakeup of the country’s natural gas sector that may also affect natural gas supplies to the European Union.