Anders Fogh Rasmussen also said the decision to leave the 28-country bloc club would dangerously fragment the continent and result in the end of the bloc.
The ex-NATO’s chief, who is also former prime minister of Denmark, said today: “Great Britain plays a crucial role in the balance of the EU.
“It is a strong voice for reform. Economic and security policy means [much to the] country, so if they leave the EU, it will all be lost and you will see a very introverted Europe.”
But in a scaremongering rant in a bid to help the Remain campaign, Rasmussen also said an out vote could also plunge the continent back into a time before the Second World War.
He added: “The result [of a Brexit] will be a fragmented Europe, where we return to the past.
“If we restore the nationalist approach to politics in Europe, we are in fact back at the time before World War Two.”
The former Danish prime minister’s comments come after David Cameron warned peace in Europe could be at risk in Britain votes to leave the bloc.
Rasmussen is one of five ex-NATO chiefs who warned a British exit from the EU would help enemies of the West.
The Europhile also blasted politicians using the EU as a scapegoat for the ongoing migrant crisis and economic difficulties in their countries.
Mr Rasmussen said: “Many national politicians use the EU as scapegoat every time there is something that is uncomfortable at home. [They do it] because it was decided in Brussels.
“If one criticises the EU daily, one can’t expect people to back it up when there is a referendum.”
Rasmussen is one of five ex-NATO chiefs who warned a British exit would help enemies of the West
Rasmussen’s comments come after David Cameron warned peace in Europe could be at risk
Other former NATO-chiefs warned a Brexit would reduce Britain’s world standing.
In an open letter the group wrote: “Brexit would undoubtedly lead to a loss of British influence, undermine NATO and give succour to the West’s enemies just when we need to stand should-to-shoulder across the Euro-Atlantic community against common threats.”
The warning comes less than 24 hours after a far-right candidate was narrowly beaten in
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