North Korea lost fuel prior to the signing of the treaty on inspections.

Supply of fuel to North Korea cease until Pyongyang does not sign a treaty renouncing nuclear weapons, transmits Agency France Presse.
This was on Friday told the representative of the U.S. State Department Sean McCormack. According to him, pushed for such measures fail the next round of talks on North Korea's nuclear program held in Beijing last week.
McCormack said that suspended deliveries not only from the U.S., South Korea, Japan and China, but also from Russia, which had reached "agreement" on the issue. Later in the State Department confirmed that the last Russian ship with fuel razgruzitsya next week, as this supply for technical reasons, can not undo, but it will last until Pyongyang would not make concessions.
According to the State Department, the DPRK government has already appealed to Australia and the European Union in an attempt to replace lost sources of fuel.