I think you will find that having a PPL shows an existing interest in aviation, but I think few air forces, of whatever country, would require their applicants to have any pre-existing qualifications, in deed very few prospective RAF pilots have any flying experience.
Read the the thread above, OFFICER and AIRCREW 'CANDIDATES' PLEASE READ THIS THREAD FIRST, which has loads of advice for those wanting to join the RAF - a lot of it will apply to other air forces.