Israel was linked to the interception of the missing cargo ship Arctic Sea last month, a senior figure close to Israeli intelligence has told the BBC.Israeli media are linking the Arctic Sea incident to reports in the Hebrew language daily Yediot Aharonot of a clandestine visit by Mr Netanyahu to Moscow on Monday.
The prime minister's office insisted that he had been visiting a "security installation inside Israel".
The Kremlin press service said "nothing is known" about the reports, AP news agency reported. Dmitry Peskov, a spokesman for Prime Minister Vladimir Putin, added that he had no information about any visit by Mr Netanyahu, Russia's Interfax news agency said.