By Susan Watts
BBC Newsnight Science editor

The world needs cyber war "Rules of Engagement" to cope with potentially devastating cyber weapons, Russian and US experts will tell world leaders at a security conference on Friday.

The cyber proposal, seen exclusively by Newsnight, comes from the influential EastWest Institute in New York.

It describes "rendering the Geneva and Hague conventions in cyberspace".

Cyber security is on the agenda at the annual Munich Security Conference for the first time this year.

Those attending the conference include UK Prime Minister David Cameron, German Chancellor Angela Merkel, US Secretary of State Hillary Clinton and Russian Foreign Minister Sergei Lavrov.

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