Britain risks being vulnerable to enemy action, including cyber attacks, unless adequate resources are urgently devoted to the nation’s defence, the head of the British Army will warn today in a keynote speech.

Pointing  to conventional threats, General Sir Nick Carter will stress that Vladimir Putin’s Russia has built an aggressive military force which this “country would struggle to match”. He will describe how the Kremlin has been ready to use its advanced capabilities in conflicts in Syria and Ukraine.

At the same time, the Chief of General Staff  will speak of clandestine cyber offensives from abroad which can affect not only public institutions, but the lives of ordinary people in this country.

General Carter’s address, at the Royal United Services Institute (RUSI) comes at a time when the Government has come under severe criticism from  politicians and former senior military officers for cutting back on defence spending. At the same time Russia has been blamed for cyber warfare on the West with claims of the US and European elections, as well as the Brexit referendum being targeted.

The Kremlin has showed its military prowess in the battlefield with missile strikes 1500km away in Syria. At the same time, Gen Carter maintains it has kept up constant sabre-rattling in Europe with simulated attacks.

“Our ability to pre-empt or respond to threats will be eroded if we don’t keep up with our adversaries. State-based competition is now being employed in more novel and increasingly integrated ways and we must be ready to deal with them,” Gen Carter will say.

“The threats we face are not thousands of miles away but are now on Europe’s doorstep – we have seen how cyber warfare can be both waged on the battlefield and to disrupt normal people’s lives. We in the UK are not immune from that.”

“We must take notice of what is going on around us or our ability to take action will be massively constrained.  Speed of decision-making, speed of deployment and modern capability are essential if we wish to provide a realistic deterrence. The time to address these threats is now – we cannot afford to sit back.”

Britain and the West also need to be aware that conventional threats are still very present. “The traditional threat still remains and last year we saw Russia undertake simulated attacks across Northern Europe (from Kaliningrad to Lithuania), we must also look closely at how countries are now being more creative in how they exploit the seams between peace and war.”

Last month the head of the Armed Forces, Air Chief Marshal Sir Stuart Peach warned that Russia poses a threat to Britain’s internet access and trade because undersea communication cables are vulnerable to the country’s navy. Russia’s “modernised” navy has the ability to disrupt the transcontinental cables and that the UK had to bolster its naval forces to counter the threat.

Defence analysts have pointed out that the UK currently has had no submarine-hunting maritime patrol aircraft since 2010 while ships and submarines which could also protect the cables have fallen too.

The Chief of the Defence Staff gave the speech only days after a think tank said an attack on the cables would deal a “crippling blow” to security and commerce and the “threat is nothing short of existential”.

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