YEKATERINBURG, Russia — Russia's president urged Iran on Thursday to find the courage to cooperate with the international community over its disputed nuclear program.

Iran's opaque nuclear program has been a tricky issue for Russia, which is uneasy about threatening decades of political and trade ties. But lately Russia has shown increasing frustration with Iran, and last month backed the newest round of UN sanctions imposed on Tehran.

"Iran must find courage and start fully fledged cooperation with the international community, even if it dislikes some of the issues it faces," Russian President Dmitry Medvedev said in Yekaterinburg, where he met with German Chancellor Angela Merkel.

Medvedev had expressed concern this week that Iran was getting closer to being able to develop nuclear weapons.

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