The resignation of Papua New Guinea's Prime Minister has provoked concerns of significant delays to the country's planned liquefied natural gas expansion, writes Russell Searancke.

Prime Minister Peter O'Neill officially resigned on 29 May following a long campaign to unseat him by his political opponents, who have made numerous claims that O'Neill is corrupt.

One of these claims was that O'Neill acted improperly in securing a loan worth more than A$1 billion from UBS to buy shares in Oil Search in 2014.