0018 GMT - JGBs fall in early Tokyo trade, tracking overnight price declines in U.S. Treasurys. JGBs and Treasurys tend to move in tandem. "Rising oil prices and disappointment in the U.S. buyback announcement weighed on government bonds," NAB's Sally Auld says in commentary. "The scale of the expanded operation appeared to disappoint the market," the group chief economist adds. The Treasury Department said it would repurchase up to $6 billion of longer-term debt at a buyback operation on Thursday. The 10-year JGB yield rises 3 bps to 2.910%, the 20-year yield adds 3 bps to 3.730% and 30-year yield gains 3 bps to 3.985%.