The Nato summit in Wales this September is "the perfect place" for the UK to urge allied forces to step up their response to military aggression from Russia, a member of the defence committee said.
Labour's Gisela Stuart admitted "state on state action was unlikely" but urged Nato to be ready to respond to threats like cyber attacks, "which may be coming from countries like Russia."
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Political leaders will go head-to-head at ITV's studios in MediaCityUK in Salford, ITV has confirmed, as the set for the event is unveiled.
More than 100 people claiming to represent working people across Britain have signed a letter backing Labour in the general election.
Nick Clegg has sent a campaign leaflet to his constituents with no Liberal Democrat logo and minimal mention of the party.