A former Moscow envoy to UK says the report is conceivable but improbable . 11,000 alleged plotter says the plan was to use military-grade land mines . The plotters were arrested last month in Odessa , Moscow , RIA Novosti reports . The announcement comes days before Putin is expected to win the presidency .
A former UK envoy to Moscow says the report is conceivable but improbable . One alleged plotter says the plan was to use military-grade land mines . The plotters were arrested last month in Odessa , Ukraine , Channel One reports . The announcement comes days before Putin is expected to win the presidency .