The Victorian Liberal Party says it has counselled a candidate for a key seat in Melbourne's south-east after questions were raised over his links to a program recruiting international students volunteers for an unidentified political campaign.A Liberal spokesperson confirmed 37-year-old finance professional Jacky Sun — the party's candidate for the seat of Glen Waverley in the upcoming state election — had been "counselled in relation to the matter", but did not say why.The statement followed questions from the ABC about Mr Sun's relationship to a volunteering opportunity marketed to international students at an event on the weekend.Liberal candidate for Glen…