WASHINGTON, Feb 9 (Reuters) - The United States and Britain have imposed sanctions against seven leading members of a notorious Russian hacking gang known as Trickbot, officials announced on Friday. Although Trickbot's malicious software has not been deployed for a couple of years, the individuals behind it remain active and still appear to be working together, according to Allan Liska, a threat intelligence analyst with Recorded Future. See here for a complete list of exchanges and delays