The global crisis has led to political upheaval in many countries, unseating three prime ministers in Europe alone.
Iran denies any encounter at Tuesday's Afghanistan Conference in the Hague. The US and Iran have had no diplomatic ties for 30 years.
More than 4,000 protesters descended on London and laid seige to the Bank of England headquarters.
What to look for as the leaders of the world's largest economies meet in London.
His actions toward protectionism speak louder than his words.
Is spring a date on the calendar or a state of mind?
Ahead of G-20, German leader balks at more spending and more debt.