RUSSIA has buried former British spy and Soviet double agent George Blake with military honours, the RIA news agency reported, four days after he died at the age of 98. Blake was buried at the Troyekurovskoye cemetery in western Moscow. President Vladimir Putin, a former KGB officer, offered his condolences over the weekend, describing him as an "outstanding professional". Britain says Blake exposed the identities of hundreds of Western agents across Eastern Europe in the 1950s, some of whom were executed as a result of his treason. He was sentenced to 42 years in prison in Britain after being unmasked…