Israel told Russia it would not launch an attack on Iran, Russian President Dmitry Medvedev said in an interview with CNN released on Sunday and he described such an attack as "the worst thing that can be imagined", Reuters reported.

Medvedev said Israeli President Shimon Peres made the comment at a meeting in the Russian resort of Sochi in August.

"When he visited me in Sochi, Israeli President Peres said something important for us all: 'Israel does not plan to launch any strikes on Iran, we are a peaceful country and we will not do this'," Medvedev said.

The chances of an agreement with the United States on a new treaty to reduce strategic offensive weapons by the end of the year remain "quite high," Medvedev said in the interview, which was recorded on Tuesday, according to a Kremlin transcript.