(This February 26 story corrects pounds to dollars in third entry) By Karin Strohecker (Reuters) – The United States, Britain, Europe and Canada announced new sanctions on Russia on Saturday – including blocking certain lenders’ access to the SWIFT international payment system – following Russia’s invasion of Ukraine on Thursday. Below are details on the measures proposed so far: SWITCHING OFF SWIFT Washington and its partners started to deploy what was widely seen as one of the harshest sanction measures: barring banks from SWIFT – a step that will stop lenders from conducting most of their f…