The 74-year-old leader, who describe himself as "a rebel with a cause", earlier served as the country's president from 2005-2015, becoming South Asia's longest-serving leader. He was also prime minister for a brief period in 2018.
In a grand ceremony with overtones of a United States presidential inauguration, heads of state and government, India Inc honchos, opposition leaders, Bharatiya Janata Party members and showbiz stars rubbed shoulders as they watched President Ram Nath Kovind administer the oath of office to India's 58 new ministers.
Modi said that the ocean economy held 'enormous promise'.
India on took up with Prime Minister Ranil Wickramasinghe the 'humanitarian' issue of fishermen's rights
Pope Francis on Tuesday called for respect of human rights and healing of racial and religious hatred as he arrived on a two-day visit to Sri Lanka, days after a new government assumed power in the country.
Dealing with the Sirisena government in Sri Lanka, says G Ganapathy Subramaniam, is a lot easier for India than engaging with the Rajapaksa regime.
In the endlessly entertaining and absorbing soap opera that is India-Sri Lanka relations, wait for the next episode, Aditi Phadnis reports.
"Looking forward to a wonderful day," Prime Minister Narendra Modi tweets before he leaves Colombo. G Sudhakar Nair/PTI reports from Anuradhapura
Prime Minister Narendra Modi on Friday flew into Colombo in the early hours for a historic visit during which he is expected to hold talks with the country's top leadership.
Reacting to the apex court's ruling, sacked Prime Minister Wickremesinghe said, "We trust that the President will promptly respect the judgment of the courts.
Prime Minister Narendra Modi sets off on Tuesday on a five-day tour of Seychelles, Mauritius and Sri Lanka that is expected to give traction to the country's Indian Ocean outreach during which he also visit a former war zone and Tamil heartland of Jaffna.
Mahinda Rajapaksa recovered from his 2015 electoral losses, went to the people and campaigned about the injustice done to him. Without attempting to be subtle, he underscored his image of the Sinhala Buddhist warrior a la Dutugemunu, the king of Sri Lanka (164 BC to 140 BC) who led the military campaign against the invading warlord Elara.
Even as the polity find ways and means to address the genuine concerns and fears of the society, the Sri Lankan State apparatus would have to unravel these mystery-questions with convincing answers, and a road-map to the future, says N Sathiya Moorthy.
Several homes, businesses and mosques in the hilly Kandy district have been damaged in anti-Muslim riots.
Violence erupted on Monday following which police imposed curfew in the Theldeniya area.
He said India wanted growth, development and peace in the region and was keen to utilise technology to pursue this goal for the shared prosperity.
Prime Minister Narendra Modi congratulated Rajapaksa and said he looks forward to further deepen relations between the two nations.
Prime Minister Narendra Modi said India will fulfil all its responsibilities with regard to climate change.
India welcomed resolution of the political crisis in Sri Lanka and exuded confidence that relations between the two countries will continue to move on in an upward trajectory.
Prime Minister Narendra Modi and Bangladesh's Sheikh Hasina had a 'very good meeting'
The National Tawheed Jamath is suspected of plotting the deadly Easter blasts.
The parliament has approved a no-trust vote against Prime Minister Rajapaksa, speaker of parliament Karu Jayasuriya announced in the House.
President Maithripala Sirisena's new Cabinet was also sworn in and Rajapaksa was named the new minister of finance and economic affairs.
Delhi finds itself between the rock and hard place in the coming Sri Lankan election, points out Ambassador M K Bhadrakumar.
Arson attacks continued on Wednesday and Muslim-owned businesses were targeted by the mobs.
US Secretary of State John Kerry on Saturday warned Sri Lanka that "true reconciliation" with Tamils will take time, even as he praised the "openness" of the new government in efforts to boost democracy, human rights and reaching out to the minority community.
Global confidence in India has been restored, says Modi.
As American Congressman rose to congratulate Prime Minister Narendra Modi on an incredible speech in Capitol Hill, an intense discussion erupted on social media about whether or not the Indian premier had chosen to go the President Barack Obama way and use a teleprompter to address the joint session.
Speaking as the chief guest at the International Vesak Day celebrations in Colombo, the prime minister said that the themes of social justice and sustainable world peace, chosen for the Vesak day, resonate deeply with Buddha's teachings.
'Gotabaya will expect India to observe the red line.' 'He even dispensed with any gesture welcoming India as an interlocutor on the Tamil issue.' points out Ambassador M K Bhadrakumar.
'It is up to New Delhi to take quick advantage of the turn of events in Sri Lanka. Otherwise, Beijing's economic clout and the deep roots it has grown in the island nation may well tempt the new President to play the India versus China game,' says Nitin A Gokhale.
Speaker Karu Jayasuriya questioned the president's decision to suspend parliament till November 16, saying it will have "serious and undesirable" consequences on the country.
'What happened last Sunday is a great tragedy, an insult to humanity'
One shocking finding of the investigation was the extent to which sexual violence was committed against detainees, often extremely brutally, by the Sri Lankan security forces, with men as likely to be victims as women.
Several people succumbed to their injuries sustained in the blasts, taking the death toll to 359.
Forty suspects, including the driver of a van allegedly used by the suicide bombers, have been arrested in connection with the attacks which shook Sri Lanka.
-- Seven suicide bombers believed to be members of an Islamist extremist group carried out the series of explosions. -- Police have so far arrested 24 people - mostly members of an Islamist extremist group - in connection with the blasts
A double-quick analysis of the Lankan election results would show that the relatively narrow victory margin of challenger Maithripala Sirisena was made up by the three minority communities of Tamils, Muslims and Christians, says N Sathiya Moorthy.
England, who have won both the one-day and Twenty20 series against Sri Lanka, play a two-day practice match in Colombo before heading to Galle which hosts the first of the three Test matches from November 6.
Reflecting growing congruence in ties, India and Sri Lanka on Tuesday held extensive talks on sticky fishermen issue, ensuring justice to Tamils and ways to deepen trade and defence engagements besides resolving to intensify cooperation in combating terror and securing the maritime neighbourhood.