sentences:  However Thatcher felt that as the US had given support to Britain during the Falklands and that America was a major ally against a possible Soviet attack in Western Europe, she felt obliged to allow US aircraft to use bases situated in Britain.Later that year in America, President Reagan persuaded Congress to approve of an extradition treaty which closed a legal loophole by which IRA members and Volunteers escaped extradition by claiming their killings were political acts.This had been previously opposed by Irish-Americans for years but was passed after Reagan used Thatcher's support in the Libyan raid as a reason to pass it.