After the almost unanimous ‘No to Deal’ by Greeks, Germany and France pressed Greece to make fast, credible proposals. France and Germany told Greece on Monday to come up with serious proposals in order to restart financial aid talks, a day after Greeks voted overwhelmingly to reject more austerity. German Chancellor Angela Merkel and French President Francois Hollande, the euro zone's most powerful leaders, said Athens must move quickly if it wants to secure a cash-for-reform deal with creditors and avoid crashing out of the single currency, Reuters reported. Raising the pressure on Greek Prime Minister Alexis Tsipras before a euro zone summit on Tuesday, the European Central Bank decided to keep a tight grip on funding to Greek banks. By voting decisively against tough bailout conditions, as Tsipras had urged them to do, Greeks have strengthened his negotiating hand. But the crisis remains acute, with the country's banks already closed for more than a week to avoid a massive outflow of money that could lead to their collapse. Only emergency support from the ECB is keeping the banks afloat and saving Greece from a chaotic euro exit that would inflict more pain on its people and gravely damage the currency, the strongest symbol of the EU's drive for an "ever closer union" on a continent once ravaged by two world wars. In a warning shot to the banks, the ECB raised the amount of collateral they must post for any loans. The move does not affect the lenders right away, but served as a reminder that their fate lies in its hands. In a sign that Athens is keen to seek a new deal, Greece's combative finance minister, Yanis Varoufakis, resigned, apparently under pressure from other euro zone finance ministers who did not want him as a negotiating partner. This is while top officials in both the United States and Japan called on both sides to seek a resolution.