By James Pearson LONDON (Reuters) – Western governments jointly warned on Wednesday about a potential threat of increased malicious cyber activity by Russia against critical infrastructure as a response to sanctions imposed as punishment for its invasion of Ukraine. The cybersecurity agencies of the United States, Britain, Australia, Canada and New Zealand – which together form the Five Eyes intelligence-sharing alliance – said the war could expose organisations everywhere to cyber crime. “This activity may occur as a response to the unprecedented economic costs imposed on Russia as well as ma…