The leaders of the G20 who meet in London next week must agree changes to the global financial system for the sake of their countries' future, Russian President Dmitry Medvedev said.

"They (the leaders) are obliged to come to this agreement," Medvedev said in an interview with the BBC posted on the Kremlin website on Sunday.

"The future of our countries, of our peoples depends on our decisiveness in taking quite cardinal decisions about changes in the global financial architecture," he added.

Group of 20 leaders from the world's developed and developing economies, including Medvedev, are due to meet in London on 2 April amid a background of growing concern over the severity of the global financial crisis.

Russia last week ahead of the G20 unveiled sweeping proposals for global financial reforms aimed at consigning an "obsolescent" economic order to the past.