"It is not yet clear whether Ukraine is willing to create the conditions for a signature," Merkel told the German parliament in Berlin, saying she would not be appeased with "lip service."
The EU nations have already given Ukraine more time to find a solution for the fate of Tymoshenko and negotiations could go right up to the start of the Nov. 28-29 summit in Vilnius.
The EU hopes Ukraine's parliament will push through laws this week to meet their concerns over the prosecutor's office and electoral conditions.
Former Polish President Aleksander Kwasniewski and former European Parliament President Pat Cox have been working for months to settle differences and will continue their efforts up to the start of next week's summit.
"Cox and Kwasniewski are still working and as long as they are working" a solution is possible, Swedish Foreign Minister Carl Bildt said.
"Everything is in the hands of President Yanukovych," Bildt said. "We have a policy. I am not quite certain that he has a policy."
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