1) Papua New Guinea
2) Thailand
3) Singapore
4) New Zealand
Explanation:
On May 26, 2019, the prime minister of Papua New Guinea, Peter O’Neill resigned following a series of high-level defections. He had been in power since 2011. He handed over the leadership of the country to former PM Julius Chan, who had served the nation twice from 1980 to 1982 and 1994 to 1997.Peter O’Neill had served the nation for almost 8 years. He was under pressure over a range of issues including a multi-billion-dollar gas project signed earlier this year with French company Total and the US firm ExxonMobil.