London - US President Barack Obama is expected to take centre stage Thursday at the Group of 20 summit in London as world leaders attempt to hammer out a new agreement on boosting global economic confidence.

In addition to a series of G20 working sessions, Obama is scheduled to hold another round of bilateral meetings with leaders attending the summit, which has been called to tackle the global economic crisis.

This includes talks with Indian Prime Minister Manmohan Singh and Saudi Arabian leader King Abdullah bin Abdul Aziz Al Saudi, who represent two of the leading emerging economies attending the summit. Saudi Arabia is also the world's biggest oil exporter.

Ahead of a breakfast meeting of the G20 leaders, Obama is also to have talks Thursday with South Korean President Lee Myung-bak. The meeting between the South Korean and US leaders are likely to focus on concerns about North Korea's nuclear ambitions. (dpa)