became the eighth president of Burma (Myanmar) since the country gained independence from Britain in 1948.
The 65-year-old head of the military-backed Union Solidarity and Development Party took oath on Wednesday in a joint session of the Parliament in the capital Naypyidaw, in a report by the BNO News.
The retired general was appointed as prime minister by the country's military junta in 2007.
As head of state, Sein will assume the power of his predecessor, Senior General who rose to power and led the country since his successful coup in 1992.
With Sein's ascendancy, the military government has been dissolved. The union members will take over the executive, judicial and legislative powers.
In the mean time, China and India have extended their assistance to the Southeast Asian nation that was hit by a 6.8-magnitude quake on 24 March that has claimed the lives of more than 150 people (official government tally: 74) and 125 hurt.
Beijing offered US$500,000 as humanitarian aid while two Chinese NGOs donated about US$15,250 (100,000 yuan) to quake victims, in a press release, said CRI English.
On Tuesday, India announced that it will donate US$1 million assistance to the calamity-hit state, said Hindustan Times.
It was earlier reported that water and rice are in short supply.
The quake was felt in bordering Thailand and Laos.
Details of this report here.