Bangkok. Thai ex-Prime Minister Thaksin Shinawatra entered prison to begin serving an 8-year sentence Tuesday, hours after returning to the country after years of self-imposed exile.

The divisive former leader returned the same day that a party affiliated with him faces a key vote on its path to form a new government.

Thaksin has said his decision to return has nothing to do with the Pheu Thai party's bid for power, but many believe the party made deals with pro-military parties to facilitate the 74-year-old billionaire's return.

Thaksin's private jet landed around 9 a.m. in Bangkok, where he was welcomed by family and supporters.

After walking out of the airport, Thaksin placed a flower wreath and prostrated himself before a portrait of Thailand’s king and queen. He spent a moment greeting supporters and the media waiting in front of the terminal but did not speak.

Hundreds of his supporters gathered outside of the airport hours ahead of his arrival, donning red, a color long associated with Thaksin, and holding sign with welcoming messages. They showed their devotion to him with songs and chants, then raised raucous cheers when he appeared at the entrance.

“I feel fulfilled that I traveled here today to pick him up. If possible I want to hug him. Everyone has tears, tears coming out of their eyes,” said Makawan Payakkae, a 43-year-old from Maha Sarakham province.

Decades ago, Thaksin promoted populist policies and used his telecommunications fortune to build his own Thai Rak Thai party and be elected prime minister in 2001 and easily reelected in 2005, before being ousted in a military coup in 2006 and fleeing into exile a few years later.

His convoy first went to the Supreme Court, which confirmed a criminal conviction and sentence given to him in absentia during his exile. He then left the court and went to Bangkok’s main prison.

His daughter Paetongtarn Shinawatra, a key figure in Pheu Thai, posted family photos with Thaksin in the middle on Facebook with a message thanking people who went to the airport to welcome her father, saying “me and my family are very grateful.”

Pheu Thai is the latest in a string of parties affiliated with Thaksin. The military coup that ousted him triggered years of upheaval and division that pitted a mostly poor, rural majority in the north that supports Thaksin against royalists, the military and their urban backers.

Less than a week before May elections, Thaksin announced he would like to return before his birthday in July, but the plan was repeatedly delayed, with he and Paetongtarn citing both post-election uncertainties and his health.

Thaksin was ousted while he was abroad in 2006. He came back briefly to Thailand in 2008 to face a court trial before fleeing the country. He has avoided returning over concerns he would not be treated fairly by the military-backed government and establishment that has long held a sharp animosity toward him.

He has remained active in Thai politics, however, often making video calls to rallies of his supporters and parties backed by him.

“Thaksin’s plans to return to Thailand were postponed after the election results were announced — this implies a strong connection between the election, formation of coalitions, and selection of the prime minister on one hand, and Thaksin’s personal agenda on the other,” said Napon Jatusripitak, a political science researcher and visiting fellow at Singapore’s ISEAS-Yusof Ishak Institute.

“Thaksin has managed to make this election about himself personally, and the direction of a Pheu Thai-led coalition heavily depends on his personal whims.”

Thaksin could wind up serving his full sentence unless he receives a royal pardon. Deputy Prime Minister Wissanu Krea-ngam of the outgoing military-linked government has said that Thaksin is eligible to request a pardon and could receive special treatment because of his age.

Napon said Thaksin’s decision to return now suggests that “he has received assurances that he will not have to serve a prison sentence in full.”