MOSCOW, April 23 - Four European states accused Russia on Thursday of trying to destroy the memory of Soviet leader Josef Stalin's crimes against his own people after a monument to Russians and other people executed by his secret police was dismantled in Siberia.Residents of the city of Tomsk woke up on Sunday to discover that a memorial complex to victims of Stalin's secret police, including a so-called "Stone of Grief" and a memorial arch, had been dismantled overnight.The mayor's office initially posted a statement saying it had acted after an unnamed resident warned that a nearby garage built on...