The fate of Greece and the euro will "largely be decided" on Monday, the EU's economic affairs commissioner said hours before the eurozone holds an emergency summit on Athens' debt crisis.

"We are approaching an absolutely decisive moment," Pierre Moscovici told French radio, adding that he believed a deal could be reached at the summit for Greece to avoid a default.

Tens of thousands of people joined an anti-austerity march through central London on Saturday, the first major public protest since Prime Minister David Cameron won last month's general election.

Demonstrators, some of whom had traveled from across Britain, carried placards with slogans such as "End Austerity Now" and "No Cuts" as they snaked through the city from the Bank of England to the Houses of Parliament.

Thousands have massed outside of the Bank of England for a march to protest against British government austerity programs and spending cuts.

Saturday's march from the financial district to Parliament Square is intended to be peaceful, but demonstrators are angry at public sector cuts meant to address government deficits, which ballooned after Britain rescued troubled banks during the 2008 financial crisis. Demonstrators argue the public is being punished for a crisis it did not cause.

Japan's telecom carrier SoftBank paid vice president and ex-Google executive Nikesh Arora a whopping $135 million in the year to March, reports said Saturday.

The amount included a one-time, sign-on bonus for the Indian-born 47-year-old, according to the Nikkei business daily and the Asahi Shimbun.

The International Monetary Fund, deadlocked with Greece over further financial aid, approved a new loan installment for Cyprus on Friday, now the only other eurozone country receiving its bailout support.

As with Greece, the negotiations between Cyprus and the so-called troika -- the IMF, European Commission and European Central Bank -- had bogged down over the economic reforms demanded by the creditors in exchange for the financing.

EU president Donald Tusk told Greece to accept a debt deal with its international creditors or face defaulting as he prepared an emergency summit Monday on Athens's future in the eurozone.

"The situation of Greece is getting critical," Tusk said in a video message Friday.

European Commission chief Jean-Claude Juncker voiced frustration with Greek Prime Minister Alexis Tsipras in a media report Friday amid the deepening debt crisis.

"I don't understand Tsipras," Juncker told German news weekly Der Spiegel after he and Tsipras recently fell out a number of times.

Russia and Greece agreed Friday to sign a preliminary agreement to build a gas pipeline, with the two countries coming together amid a raging debt crisis in Athens and new Western actions against Moscow.

President Vladimir Putin was set to meet Greek Prime Minister Alexis Tsipras later Friday on the sidelines of an investment forum overshadowed by Russia's economic crisis and standoff with the West.

Indonesia announced Friday it will grant a 30 percent stake of the Mahakam gas block to be shared between French Total and Japanese Inpex, while giving the majority stake to state-owned oil firm Pertamina in 2018.

Oil giant Total, along with Inpex, has been running Mahakam, a huge natural gas block offshore of East Kalimantan province, since 1967. Total has expressed it wanted to continue operating the block when the contract expires at the end of 2017.

The European Central Bank's decision-making governing council will hold an emergency session Friday to discuss a request from the Bank of Greece for an increase in liquidity to Greek banks, sources familiar with the matter told Agence France Presse. 

The council will hold a teleconference at around midday (1000 GMT) to discuss a possible increase in the Emergency Liquidity Assistance facility, as deposit withdrawals from Greek banks have accelerated in recent days, sources said, speaking on condition of anonymity.