Rubuta ci gaba don wannan sakin layi - Buckley ya kuma kasance tare da Ireland a matakin kasa da kasa na kasa da kasa. Ya kasance wani bangare na Irish da aka kafa a makarantar da kuma karkashin 18. Kodayake ya kasance wani ɓangare na 'yan wasan Ireland na ƙasa da 20 na Allen Clarke don duka Under-20 Six Nations da Junior World Cup a 2010, bai taɓa yin bayyanar da gefen ba. A babban matakin, an zaɓi Buckley don tawagar Ireland mai tasowa don shiga gasar cin kofin Tbilisi ta 2015
, wanda Clarke ya sake horar da shi. Ya buga wasanni biyu daga cikin wasanni uku na kungiyar yayin da suka lashe gasar a karon farko.