"We encourage all of Turkey's elected representatives, including President Erdogan, to represent the diverse views of all of Turkey's citizens and to strengthen Turkey's democracy". Russian President Vladimir Putin sent Erdogan a congratulatory telegram on Monday, one of the first world leaders to do so.
While known overseas as an Islamic politician, Erdogan has in recent years increasingly taken on the clothes of a nationalist, spearheading operations against Kurdish militants and inside Syria.
What do the new powers mean?
The constitutional changes were endorsed in a tight referendum past year by 51% of voters.
The presidential and parliamentary elections will complete Turkey's transition from a parliamentary system to a new executive presidential one, a move approved in a referendum a year ago.
Erdogan won an election on Sunday that strengthens his increasingly authoritarian rule. The new constitution will-under certain conditions-allow the 64-year-old to stand for a third term in 2023, potentially leaving him in power until 2028.
The head of Turkey's electoral board says 99.91 percent of the ballots cast in Sunday's dual presidential and parliamentary elections have been "processed" so far.
Who won the Turkey election?
For now, though, this is Mr Erdogan's time.
How did the opposition react?
The leading Turkish opposition party said it believes the results for the presidential elections are incomplete and may go to a second round.
"The new regime that takes effect from today is a major danger for Turkey".
At a time when Erdogan and his government are drawing harsh criticism from the worldwide community in terms of the downward course of democratic rights in the country and foreign policy disagreements with Western allies, his next steps under the one-man regime will be determinant for the country's global position.
But he said that there was no significant difference between official results and his party's figures, and therefore he would accept the outcome.
Rumours that the vote had been rigged were spread by critics, who suggest that voter fraud and intimidation has taken place.
How was the election conducted?
Polling stations were due to close at 1400 GMT, with the first results expected late in the evening.
Monitors did praise the high turnout in the Turkish vote, which was reported to be over 87 per cent by the state-run Anadolu Agency.
"Erdogan and his team will earn experience and will try to correct the system's flaws while implementing it", he said, adding that there will be new decrees and legislations to achieve that.
The HDP passing the threshold is key for the opposition: Forecasts show that without them in parliament, the AKP and their junior coalition partner, the Nationalist Movement Party (MHP), would once again win the majority of seats.
The opposition CHP and its allies won only 33% (190 seats). These two parties will have 146 and 43 seats in parliament, respectively.
And in a situation labelled as blatant unfairness by activists, the HDP's Demirtas has campaigned from a prison cell after his November 2016 arrest on charges of links to outlawed Kurdish militants.
The biggest issue for voters was the economy. The Turkish lira tumbled in recent weeks and has lost 20 percent against the dollar this year. Mr. Erdogan's rigged referendum in 2017 was barely approved, with just 51.5-per-cent support.
Following the failed coup, Turkey has been under a state of emergency for almost two years and has seen a widespread crackdown on alleged supporters of Gulen. More than 50,000 people have been imprisoned pending trial since the uprising.
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