<sod >The relationship came to an abrupt end when Mr Skripal was arrested by the Russians in December 2004.Â  He was freed in 2010, in what is thought to have been the biggest spy swap since the Cold War.< eod>< sod > But in December 2004 Mr Skripal was arrested by the Russians,Â He was jailed for treason in 2006 but freed in 2010, in what is thought to have been the biggest spy swap since the Cold War.< eod>