President Recep Tayyip Erdogan’s re-election grants him five more years to deepen his conservative imprint on Turkish society and to realize his ambition of increasing the country’s economic and geopolitical power.

Turkey’s Supreme Election Council named Mr. Erdogan the victor after a runoff election on Sunday. He won 52.1 percent of the vote against the opposition candidate Kemal Kilicdaroglu, who had 47.9 percent with almost all votes counted, the council said.

The election was closely followed by Turkey’s NATO allies, including the United States, who have often seen Mr. Erdogan as a frustrating partner because of his anti-Western rhetoric and close ties with President Vladimir V. Putin of Russia, which have grown since Russia’s invasion of Ukraine.

Mr. Erdogan has given no indication that he plans to change his policies abroad, where he has sought to use Turkey’s place at the juncture of Europe, Asia and the Middle East to expand its influence, or at home, where has consolidated power in his hands and responded to an inflation crisis with unconventional measures that economists said exacerbated the problem.