Germany's Angela Merkel urged Russian President Vladimir Putin on Wednesday to help stem violence in eastern Ukraine and said the West would not hesitate to impose stricter economic sanctions on Russia if it failed to cooperate.
Speaking ahead of a summit of the Group of Seven major industrialised nations, a meeting Russia was supposed to host but has been excluded from because of its seizure of Crimea, Merkel presented Putin with a straight choice.
"It is decisive that President Putin use his influence to get the separatists to refrain from violence and intimidation," she told the German parliament, referring to Russia-allied militants fighting in eastern Ukraine. "If this doesn't happen ... we won't shrink from imposing further sanctions."
The United States and European Union have imposed travel bans and asset freezes on dozens of Russian and Crimean officials since the annexation of the Ukrainian peninsula in March, but have not yet moved to more severe economic sanctions.
Those were threatened if Russia took further steps to destabilise Ukraine. With elections having gone smoothly, and new President Petro Poroshenko to be sworn in on Saturday, some have concluded that Putin has stepped back from the brink.
A draft of the G7 communique seen by Reuters calls on Russia to "accelerate withdrawal of military forces from the eastern border with Ukraine" and "exercise its influence among armed separatists to lay down their weapons".
President Barack Obama met Poroshenko for talks in Warsaw on Wednesday and declared him a "wise choice" to lead Ukraine.
Poroshenko, a chocolate-industry billionaire, said he would be willing to meet with Putin on the sidelines of the D-Day anniversary commemorations in Normandy, France on Thursday, although no meeting has been set up.
"As things stand now, a meeting between me and Putin is not envisaged, but I do not rule out that it could take place in one format or another," he told reporters, adding that he was working on a peace plan for Ukraine that would involve the decentralisation of power, local elections and an amnesty.
Tensions on Europe's eastern frontier will be the focus of discussion among G7 leaders over dinner, including how best to support Poroshenko and Ukraine's shattered economy.
The threat of imposing further costs on Russia if necessary will be kept on the table.
With the United States having broadly taken a firmer line against Russia than Europe, which has critical energy ties with Moscow, US officials said the key was for the West to maintain a united front, an issue Obama raised with Poroshenko.
"They discussed the need for the international community to continue to speak with one voice on the subject of Ukraine," said Ben Rhodes, Obama's deputy national security advisor.
While Putin has been cut out of the G7, he will hold face-to-face meetings with Merkel, French President Francois Hollande and Britain's David Cameron at the D-Day anniversary, potentially an opportunity to work on those who oppose him.
Rhodes said it wasn't important that Putin was holding the meetings but "what people say in those meetings".
Ahead of the summit - the first without Russia since it joined the G7 in 1997 - officials said they were not yet ready to conclude Moscow was playing a more cooperative role.
"It is up to Russia to behave in line with international law and the values that are G8 values," said one official when asked if Russia could rejoin the G8 at some point soon. "It's a bit early at this stage, but I wouldn't rule out the heads of state discussing how they see the future of the G7 or the G8."
Russia denies it is behind the revolt in eastern Ukraine, where militias allied to Moscow have seized buildings, attacked Ukrainian troops and declared independence. Putin has also defended his right to protect Russian-speaking people.
ECONOMICS AND TRADE
As well as foreign policy, the two-day summit will cover economics, trade, climate and energy policy.
One of the most sensitive discussions will be over energy security, particularly in Europe, which relies on Russia for around a third of its oil and gas - a fact that gives Moscow leverage over the EU and its 500 million people.
European leaders have committed themselves to diversifying away from Russia but doing so will take time and be costly, and may in part depend on the willingness of the United States to supply liquified natural gas to Europe.
"The use of energy supplies as a means of political coercion or as a threat to security is unacceptable," G7 leaders will say, according to the draft communique.
"The crisis in Ukraine makes plain that energy security must be at the centre of our collective agenda and requires a step-change to our approach to diversifying energy supplies."
The economic discussion is not expected to break new ground, instead reiterating that all the G7 members - the United States, Canada, Germany, France, Britain, Japan and Italy - must focus on sustaining economic recovery and tightening regulations to prevent future banking sector problems.
"We will take further steps to support strong, sustainable and balanced growth, with a common goal of increasing the resilience of our economies," the draft communique said.
"We agreed that 2014 will be the year in which we focus on substantially completing key aspects of the core financial reforms that we undertook in response to the global financial crisis," including ending "too-big-to-fail" banking.
