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."
More top news
The EU will not hold talks with the UK until it triggers Article 50 to leave, Germany, France and Italy insist.
Jamie Oliver has launched an expletive-filled rant against Boris Johnson, calling on the public to ensure he does not become Prime Minister.
David Cameron has addressed Parliament for the first time since Britain voted to leave the European Union.