Leaders of the Group of 20 major industrialized and developing economies are meeting in Mexico to discuss ways to boost the faltering world economy.
The summit comes one day after Greek parties supporting the debt-crippled country's deal with international lenders narrowly won in elections.
The G20 leaders are expected to press European officials to seek a lasting solution to the eurozone's debt crisis.
Reports say the leaders are also expected to support increasing the International Monetary Fund's bailout reserves with an additional $430 billion.
On the sidelines of the summit in the Pacific resort of Los Cabos, U.S. President Barack Obama and Russian President Vladimir Putin are expected to hold a meeting focusing on disagreements between Moscow and Washington over how to respond to the Syrian conflict. It's their first meeting since Putin returned to the Kremlin as president in May.
During the summit, Putin will hold eight major bilateral meetings and attend a mini-summit of the BRICS group, which includes Brazil, Russia, India, China, and South Africa.
Putin will also hold talks with Japanese Prime Minister Yoshihiko Noda, British Prime Minister David Cameron, Turkish Prime Minister Tayyip Erdogan, Indian Prime Minister Manmohan Singh, Brazilian President Dilma Rousseff, Indonesian President Susilo Bambang Yudhoyono, and Mexican President Felipe Calderon.
Based on reporting by Reuters, AP, and Interfax