Merkel had late yesterday discussed the Ukraine crisis in phone calls with the country's President Petro Poroshenko as well as with Kazakh President Nursultan Nazarbayev, her spokeswoman said in a statement.
"The chancellor welcomed the exchange of prisoners between the Ukrainian government and the separatists," in which almost 150 government troops and more than 220 insurgents were freed, said the statement.
Ukraine's allies in Europe hope the exchange will propel peace talks held in Minsk, to reinforce a largely ignored peace plan struck in September. But a final round of negotiations Friday, which was meant to lead to a comprehensive truce deal, has been indefinitely postponed.
Merkel "appealed to the Russian government to use its influence on the separatists to this this end," added the Berlin statement.