For her part, Merkel said that "Ukraine's role as a transit country should be maintained and Germany is ready to play its role."
Russia's Gazprom plans to build a second pipeline under the Baltic Sea to Germany, called Nord Stream 2, that would give it more possibility to reduce transit of gas through Ukraine to Europe when it is finished in 2019.
Ukraine has so far rejected proposals from Gazprom that would reduce the volumes of gas shipped through the country.
Merkel said that while Germany looks at Nord Stream 2 as a business project "there are other elements, so we need to think about guarantees for Ukraine".
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