In yet another bombshell disclosure this week, the online site WikiLeaks is shedding disturbing new light on the “special relationship” that once bound the United States and Great Britain.

Now-public embassy cables released Friday by WikiLeaks seem to suggest that the United States secretly agreed to share sensitive information about Britain’s nuclear program in exchange for Russian cooperation in signing a key arms treaty.

According to an exclusive report from the UK’s Telegraph, the United States government agreed to share information about every Trident missile the U.S. supplies to Britain with Russia as part of an agreement President Barack Obama is expected to sign on to next week.

Details of the behind-the-scenes talks are contained in more than 1,400 US embassy cables published to date by the Telegraph, including almost 800 sent from the London Embassy, which are published online today. …

A series of classified messages sent to Washington by US negotiators show how information on Britain’s nuclear capability was crucial to securing Russia’s support for the “New START” deal.  Although the treaty was not supposed to have any impact on Britain, the leaked cables show that Russia used the talks to demand more information about the UK’s Trident missiles, which are manufactured and maintained in the US.

Washington lobbied London in 2009 for permission to supply Moscow with detailed data about the performance of UK missiles. The UK refused, but the US agreed to hand over the serial numbers of Trident missiles it transfers to Britain.

Professor Malcolm Chalmers said: “This appears to be significant because while the UK has announced how many missiles it possesses, there has been no way for the Russians to verify this. Over time, the unique identifiers will provide them with another data point to gauge the size of the British arsenal.” …

While the US and Russia have long permitted inspections of each other’s nuclear weapons, Britain has sought to maintain some secrecy to compensate for the relatively small size of its arsenal.

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