Philip Hammond warns defence cuts 'risk capability'
Further big cuts in defence spending will lead to the loss of the UK's armed forces capability, Defence Secretary Philip Hammond has warned.
Things were "extremely taut" after the biggest cuts since 1991, he said ahead of the chancellor's spending review.
He told the BBC he would be "fighting the corner for my budget and defence".
The Ministry of Defence said while budgets for 2015-16 onwards had yet to be set, it had been promised a 1% annual increase in equipment spending.
Britain currently spends around £34bn a year on defence.
Speaking to the BBC, as he watched a Royal Marines training exercise in Norway, Mr Hammond said: "There may be some modest reductions we can make through further efficiencies and we will look for those, but we won't be able to make significant further cuts without eroding military capability."
He added: "We have some very challenging targets ahead of us to deliver the outcome of the last spending review and I'm clear that we won't be able to deliver big further savings.
"But we need to look broadly across government at how we are going to do that, not just narrowly at a few departments."
Reductions in defence spending for 2013-15, in addition to those in 2010's Strategic Defence and Security Review, were outlined in last year's Autumn Statement.
And Downing Street said last month the military would not be immune from further financial cuts in Chancellor George Osborne's next spending review - which is due to be published before the end of this year and will set out government spending plans for the first half of the next parliament.
A report this week from the Royal United Services Institute (Rusi) suggested this could lead to additional reductions of more than £1bn a year in the defence budget from 2015.
However, returning from a trade visit to India in February, Prime Minister David Cameron said he was open to the idea of diverting money from the UK's £10bn aid budget to MoD projects, including peacekeeping and other security-related development.
In a Daily Telegraph interview, Mr Hammond said a number of Conservative cabinet ministers believed "that we have to look at the welfare budget again... if we are going to get control of public spending on a sustainable basis".
BBC defence correspondent Jonathan Beale says that, because Mr Hammond and other Tory ministers want a greater proportion of savings to come from the welfare budget, they are on a collision course with their Liberal Democrat partners.
Former leader of the Lib Dems, Sir Menzies Campbell, told BBC Radio 4's Saturday PM programme he understood the defence secretary's concerns, warning: "The real issue is you have to balance your resources against your ambitions, and the problem at the moment is that the resources keep being reduced, but the ambitions stay as grand as ever."
He admitted looking elsewhere for possible cuts was a "difficult issue" for the coalition, but said the chancellor had a "responsibility to make sure the poorest people are protected" if the welfare budget was reduced.
Our defence correspondent says tense negotiations over the next public spending round are already under way and Mr Hammond was publicly drawing the lines of battle.
Conservative MP Patrick Mercer said Mr Hammond's comments were "a warning shot across Treasury bows and Lib Dem bows".
He told BBC Radio 5 live it came at "an extremely febrile time" on the back of the Eastleigh by-election, which the Liberal Democrats won while the Conservatives were pushed into third place.
Labour MP Paul Flynn told Radio 5 live Mr Hammond had started "the annual game of horse trading that goes on at every department saying, 'we can't have any cuts here'".
"Every department should take these cuts," he said.
Referring to a report by the Public Accounts Committee - which revealed the MoD had bought £1.5bn worth of equipment between 2009 and 2011 that it had not used - he said it had been "most outrageously wasteful in spending".
In response to Thursday's report, the government pledged "to reverse decades of lax inventory management".
Scottish National Party MSP Bill Kidd said a "simple" solution to save money within the defence budget was not to renew the Trident nuclear weapons programme "which would save £100bn".