jermain defoe scored a superb dipping volley against newcastle to secure a 1-0 win for sunderland in the wear-tyne derby .
the 32-year-old believes that the goal has vindicated his decision to return to the premier league from mls side fc toronto .
defoe has compared the feeling of scoring the winner in the derby to scoring for england at a world cup .
sunderland have beaten newcastle in their last five consecutive meetings .