French nationalist leader Marine Le Pen has formally initiated her presidential campaign, making the announcement just hours after a significant legal development.

A court of appeal confirmed a guilty verdict against Le Pen, a ruling that could have potentially hindered her political aspirations.

Despite the judicial setback, Le Pen demonstrated defiance by immediately pivoting to her electoral challenge for the nation's top political position.

Her swift launch underscores a determination to contest the presidency, irrespective of the court's decision.