Merkel told reporters that she and the German government were working to ensure Ukraine's presidential elections can take place on May 25 and she urged all parties, including Russia, to help.
"We believe that the possibility of round tables under the guidance of the OSCE (Organisation for Security and Cooperation in Europe) offers here a good possibility," she said of the Ukrainian national talks set for Wednesday.
"The more representative the round tables are, the better that is," she added.
She was speaking after talks in Berlin with the heads of five international financial organisations on the state of the global economy, as part of a series of regular similar gatherings she has hosted since 2007.
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Merkel also termed Sunday's independence referendum in eastern Ukraine claimed by rebels to have been a resounding victory as "illegal" and said she therefore wasn't so interested in the result.
"I'm waiting for the elections on May 25," she said.
Kiev is hosting a round table meeting tomorrow involving the government, parliament and regional leaders but notably not any separatist representatives.
For her part, International Monetary Fund chief Christine Lagarde voiced hopes at the same press conference that "every party concerned, including Russia," would participate in supporting Ukraine's economic stabilisation.
Lagarde had warned in an interview with a German newspaper yesterday that the crisis in Ukraine could have "severe" economic consequences for other countries, even though its contagion risk was hard to predict.