Ariyanethiran was trustee of Kokkatticholai Sivan Temple and editor of Thamil Alai (Tamil Wave), a Liberation Tigers of Tamil Eelam newspaper.[2] He was selected by the LTTE as one of the Tamil National Alliance's (TNA) candidates in the Batticaloa District at the 2004 parliamentary election but failed to get elected after placing fifth amongst the TNA candidates.[3] However, Ariyanethiran entered Parliament in May 2004 following the resignation of Kingsley Rasanayagam.[4] It has been alleged that the LTTE abducted and forced Rasanayagam to resign to make way for Ariyanethiran.[5]
In 2024, Ariyanethiran was nominated by a number of Tamil political parties as their common candidate of the 2024 presidential elections. The Ilankai Tamil Arasu Kachchi notably did not endorse Ariyanethiran.[8] Although Ariyanethiran only won 1.7% of the national vote, his performance was considerably stronger in the Tamil-majority districts of the North and East. In the Jaffna district, Ariyanethiran became the 2nd most-voted candidate, beating the likes of president Ranil Wickremesinghe and NPP candidate Anura Kumara Dissanayake. In Vanni, he was the 3rd most-voted.[9][10]