British Prime Minister David Cameron and US President Barack Obama have agreed on the need for immediate action to resolve the eurozone crisis.
Downing Street said the two leaders spoke on the phone late Tuesday ahead of the G20 summit in Mexico later this month, when world leaders will discuss Europe's financial woes.
A spokesman for Cameron said he and Obama agreed on the need for an immediate plan to tackle the crisis, as well as a longer-term strategy to secure a strong single currency.
"Speed is of the essence," Cameron told reporters in Oslo before meeting Norwegian Premier Jens Stoltenberg late Wednesday. "Clearly the euro zone crisis is the biggest threat to the world economy today," he added.
Cameron is visiting Berlin Thursday for a student conference with Chancellor Angela Merkel and Stoltenberg, where the eurozone crisis is likely to be discussed. He will then hold a bilateral meeting with Merkel.
Cameron is pressing for eurozone countries to protect their currency with measures including greater fiscal burden-sharing among member countries.