Greece has received a "generous offer" for a bailout, according to the German chancellor, in a speech.
She also said that if the Greek government wants more talks after this weekend's referendum, she will not say no.
David Cameron is to round off his whirlwind tour of major European leaders with a crucial meeting with German Chancellor Angela Merkel.
The Prime Minister is looking to build support for his plans to renegotiate the terms of the UK's membership of the EU, and he'll need the agreement of the German premier if he is to have any hope of success.
However, there has been little sign of enthusiasm for treaty change. France and Germany have reportedly agreed that closer integration of the eurozone countries can be achieved without altering treaties - potentially reducing Britain's leverage.
This morning Mr Cameron will be in Warsaw for talks with Polish counterpart Ewa Kopacz, before heading for Berlin to see Mrs Merkel.
Germany's Chancellor has once again topped the annual Forbes' 100 list which also includes the Queen, Hilary Clinton and Taylor Swift.Read the full story ›
Greece has promised to speed up implementing its extended bailout agreement and send a full list of detailed reform proposals to its eurozone partners, German Chancellor Angela Merkel has said.
Following an overnight mini-summit with Greek Prime Minister Alexis Tsipras, French President Francois Hollande and heads of the main EU institutions, Merkel said euro-area finance ministers are ready to meet soon to evaluate the reform plans.
However, she declined to set any date for releasing further aid to the cash-strapped Greek government, saying that depended on a positive evaluation of the reform proposals.
Russian aggression in Ukraine has only reinforced the unity of the US and Europe, President Barack Obama has declared.
Obama and German Chancellor Angela Merkel have been holding talks about the prospects of reviving an elusive peace plan to end the conflict.
But while the talking continues, so does the killing in eastern Ukraine.
ITV News Washington Correspondent Robert Moore reports:
German Chancellor Angela Merkel said there have been "setbacks" to reaching a diplomatic solution with Russia on the situation in eastern Ukraine.
However, Germany does not see a military solution to the Ukraine crisis, Merkel said during a press conference at the White House.
German Chancellor Angela Merkel has arrived at the White House to discuss the situation in eastern Ukraine with US President Barack Obama.
German Chancellor Angela Merkel said it was unclear it today's talks with President Vladimir Putin in Moscow will achieve a ceasefire in Ukraine.
Merkel stressed that a diplomatic solution was the only way to resolve the crisis, but said it was "unclear" if there will be further talks after today's meeting.
"It is totally open as to whether we will, with these talks, succeed in achieving a ceasefire, we don't know if that will be achieved today, if, perhaps further talks will be needed," Merkel said before departing for Moscow.
German chancellor Angela Merkel will reportedly withdraw her support for keeping Britain in the EU if David Cameron continues his drive to curb immigration into the UK.
Der Spiegel news magazine quoted sources within Mrs Merkel's office and German foreign ministry who said she feared Britain was approaching "the point of no return" unless Mr Cameron changed his strategy.
Mrs Merkel, along with other EU leaders, firmly believes the measures the Prime Minister is planning, which are widely seen as aimed to counter the threat of Ukip, would undermine the principle of the free movement of labour.
According to The Sunday Times, Mr Cameron's awareness of German opposition has seen him ditch a proposal to impose quotas on low-skilled EU migrants but he will still bid to stretch the EU rules "to their limits".