Russia may stop implementing a key defence treaty because of concerns over US plans for a missile shield in Europe, President Vladimir Putin said. Mr Putin made the threat during his annual address to parliament - which he said would be his last as president. He also hit out at an influx of foreign money which he said was being used to meddle in Russia's internal affairs. US Secretary of State Condoleezza Rice dismissed Russian concerns over the missile shield as "ludicrous". BBC diplomatic correspondent Jonathan Marcus says Mr Putin's speech marks a significant raising of diplomatic stakes. The Russian...