German leader Merkel urges Russia to put more pressure on Ukrainian rebels to back cease-fire

Russian President Vladimir Putin, left, and German Chancellor Angela Merkel walk away after a wreath-laying ceremony at the Tomb of the Unknown Soldier, marking the 70th anniversary of the defeat of the Nazis in World War II, in Moscow, Russia, Sunday, May 10, 2015. (Host photo agency/RIA Novosti Pool Photo via AP) (The Associated Press)

German Chancellor Angela Merkel, left, and Russian President Vladimir Putin shake hands during their meeting in the Kremlin in Moscow, Russia, Sunday, May 10, 2015. Angela Merkel attended a wreath-laying ceremony at the Tomb of the Unknown Soldier, marking the 70th anniversary of the defeat of the Nazis in World War II, in Moscow. (Sergei Karpukhin/Pool Photo via AP) (The Associated Press)

German Chancellor Angela Merkel, left, and Russian President Vladimir Putin meet in the Kremlin in Moscow, Russia, Sunday, May 10, 2015. Angela Merkel attended a wreath-laying ceremony at the Tomb of the Unknown Soldier, marking the 70th anniversary of the defeat of the Nazis in World War II, in Moscow. (Sergei Karpukhin/Pool Photo via AP) (The Associated Press)

German Chancellor Angela Merkel has called during a visit to Moscow for Russia to do more to persuade separatists in eastern Ukraine to abide by a cease-fire that has been strained in recent weeks.

Speaking alongside Russian President Vladimir Putin at a press conference, Merkel said the past week's creation of groups to negotiate a lasting settlement of the dispute provided a "glimmer of hope" but that progress was lacking elsewhere.

Ukraine says more than 8,000 people have died in the conflict that began in April 2014.

Merkel was the only prominent European leader to visit Russia over the weekend to mark the 70th anniversary of the surrender of Nazi Germany. On Sunday, she laid a wreath at the Tomb of the Unknown Soldier by the walls of the Kremlin.