The Bush administration is planning to send some 21,000 troops into Iraq in addition to the 138,000 already there, in a last-ditch effort to restore security in the country.
 
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Josh Rushing, Al Jazeera's military analyst, said the British move could cause problems for the Bush administration which is trying to argue for an escalation in US troops in Iraq when its main ally seems to be pulling out.
 
He said Blair's reported announcement would make the argument in Washington for what is being called a "troop surge" much more difficult to maintain.
 
"What was once called the coalition of the willing, was really just the US and Britain – and now Britain seem to be pulling out," he said.
 
Britain currently has about 7,100 troops in Iraq, most of them based around the southern city of Basra.
 
The British force is the second-largest foreign contingent of soldiers after that of the United States, which has more than 140,000 troops in Iraq.
 
'Grateful'
 
Britain in Iraq

Peak of 46,000 UK troops deployed for 2003 invasion

 

Some 7,100 still serving in Iraq, several hundred others on ships in Gulf

 

132 UK soldiers have died in Iraq since 2003

 

British operations in Iraq under codenamed Operation TELIC

 

Troops largely deployed in southern Iraq mainly based in Basra, small number also based in Baghdad

 

10 soldiers killed in aircraft crash in early 2005, single largest loss of life for British troops

 

Total cost to UK of Iraq war to date: about $7.8 bn

Gordon Johndroe, a spokesman for the Bush's administration's National Security Council, said Blair had informed Bush of his plans to withdraw troops on Tuesday morning.
 
He suggested that Blair's move was a signal of increasing stability in Iraq.
 
"President Bush sees this as a sign of success and what is possible for us once we help the Iraqis deal with the sectarian violence in Baghdad," Johndroe said.
 
"The president is grateful for the support of the British Forces in the past and into the future.
 
"While the United Kingdom is maintaining a robust force in southern Iraq, we're pleased that conditions in Basra have improved sufficiently that they are able to transition more control to the Iraqis."
 
He added: "The United States shares the same goal of turning responsibility over to the Iraqi Security Forces and reducing the number of American troops in Iraq."
 
Analysts predict further violence
 
Colonel Bob Stewart, the former commander of British forces in Bosnia, said that while Iraqi troops might soon replace British troops on the streets of Basra, the UK's involvement in southern Iraq was far from at an end.
 
"The British have decided that in order to get out the precondition is that the 10th Iraqi Army division must be good enough, so they have put an enormous amount of time and effort into training them," he told Al Jazeera.

"The British have always wanted to get out ... but they'll be putting a masssive effort into continuing the training and the training will continue I expect long after the British soldiers have come of the Iraqi streets.

"The British can't withdraw until they feel the Iraqi armed forces are in a position to do the job without support."