Venezuela's PDVSA is moving to offload a crude cargo stuck on board a Knutsen Group tanker for more than a year.

Documents seen by Reuters show the state oil company was planning to discharge nearly 1m barrels of crude from the 146,000-dwt Gerd Knutsen (built 1996) last week.

The move is part of a battle between PDVSA and its refining unit Citgo, which owns the cargo and is controlled by president Nicolas Maduro's opposition rival Juan Guaido.