BERLIN (AP) - Germany's chancellor urged Ukraine's president Monday to strengthen media freedoms in his country, while stressing the potential for further cooperation between the two nations on energy issues.

Germany sees unanswered questions regarding some democratic processes in Ukraine, "in particular in the area of press freedom and the freedom of expression," Chancellor Angela Merkel told visiting President Viktor Yanukovych.

Merkel said both sides agreed to openly and frankly discuss those issues in the future, if critical questions arise.

International rights groups have expressed concern about a deterioration of media freedom in Ukraine since the Moscow-friendly Yanukovych was elected to office in February.

Global media rights watchdog Reporters Without Borders in July said there were alarming signs on censorship, political pressure and physical attacks against reporters.

Yanukovych did not address the issue but said it is in his greatest interest that the process of democratization in Ukraine successfully continues.

In other comments, Merkel said Germany wants to actively participate in the forthcoming restructuring of the Ukrainian gas transport system.

"We agreed that we want to cooperate here in a very concrete manner," Merkel said.

Ukraine is the main transit hub for deliveries of Russian natural gas to Germany. Spats between Russia and Ukraine over transit fees have in the past led to disruptions of crucial deliveries to Germany and Western Europe.

Yanukovych said it was in Germany's and Europe's interest to participate in the restructuring of the gas transport system since it will give the countries control over its use in the future, boosting their energy security.

"It's about finding solutions that exclude instability for the future regarding the gas deliveries to Europe," Yanukovych said through a translator, welcoming Germany's participation.

The president praised the talks in Berlin as a new start to a strengthened cooperation with Germany which he called "a strategic partner within the European Union."

Yanukovych said negotiations about visa-free travel for Ukrainians into the EU are on a good track, predicting a solution "in the foreseeable future."

German Interior Minister Thomas de Maiziere and his Ukrainian counterpart, Anatoly Mogilev, also signed an agreement on cooperation between the law enforcement agencies of the countries, particularly in the struggle against organized crime and terrorism, the ministry said.