RUSSIA would view any spillover of the Iran conflict into the Caspian Sea "extremely negatively", Kremlin spokesman Dmitry Peskov said on Tuesday.

Israel said last week its military had carried out strikes on the Iranian navy in the Caspian, hitting dozens of targets including missile boats. A military spokesperson said Israel had managed to take out Iran's naval capabilities there.

Russia and Iran, which signed a strategic partnership treaty last year, both border the Caspian Sea.

On the state of negotiations between Washington and Tehran, Peskov said the Kremlin was observing contradictory statements from both parties.