Erdogan will this week immediately turn to foreign policy, visiting northern Cyprus and Azerbaijan, followed by more challenging encounters at a North Atlantic Treaty Organisation summit in Brussels where he will meet US President Donald Trump and other leaders.
Turkish President Recep Tayyip Erdogan greets deputies during a meeting of the Grand National Assembly of Turkey in Ankara, Turkey on July 7, 2018.
Erdogan, 64, says a powerful executive presidency is vital to drive economic growth, ensure security after a failed 2016 military coup and safeguard Turkey from war across its southern border in Syria and Iraq.
Erdoğan took the oath of office in a ceremony in the Grand National Assembly, the culmination of almost a decade of political activism to transform the country's parliamentary democracy into a presidential system.
In a referendum a year ago, Turkish voters approved a series of comprehensive changes that granted significantly more powers to the president, eliminated the prime minister position and increased the size of the country's parliament, to name a few.
Erdogan will this week immediately turn to foreign policy, visiting northern Cyprus and Azerbaijan followed by more challenging encounters at a North Atlantic Treaty Organisation summit in Brussels where he will meet his United States counterpart Donald Trump and other leaders. Marc Pierini, a former European Union ambassador to Turkey and a visiting scholar at Carnegie Europe, said Erdogan's new powers would effectively make him a "super-executive president".
Opponents say the move marks a lurch to authoritarianism, accusing Erdogan of eroding the secular institutions set up by modern Turkey's founder, Mustafa Kemal Ataturk, and driving it further from Western values of democracy and free speech.
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But the pro-government daily Yeni Safak hailed it as an "historic day", saying: "One page is closing in Turkish history and a new page is opening".
"Turkey is entering a new era with the presidential oath ceremony on Monday", Mr Erdogan told members of his ruling Justice and Development Party (AKP) ahead of the swearing in.
The transition ceremony later Monday, to be attended by some 10,000 guests and marked by dozens of gun salutes, has been overshadowed by a deadly train derailment in northwest Turkey on Sunday that left 24 dead.
After the inauguration, Erdogan will immediately turn to foreign policy, visiting northern Cyprus and Azerbaijan, both traditional first ports of call for a newly elected Turkish leader.
Sudan's President Omar al-Bashir is on the guest list as is Emir Sheikh Tamim bin Hamad Al-Thani of Qatar, Turkey's closest ally in the Middle East.
He has said he will announce the cabinet on Monday night, promising to make appointments from outside parliament and to slim down his ministerial team to 16 from more than 20.
Turkish Presidential Press Secretary Ibrahim Kalin.
Erdoğan, who has ruled Turkey as prime minister and then as president for 15 years, won a snap election last month with 52% of the vote.