I nominate Recep Tayyip ErdoÄŸan, president of Turkey, as the most inconsistent, mysterious, and therefore most unpredictable major politician on the world stage. His victory in a referendum last Sunday formally bestows him with near-dictatorial powers that leave Turkey, the Middle East, and beyond in a greater state of uncertainty than ever.

Here are some of the puzzles:

The Apr. 16 ballot offered a simple yes ("Evet") or no ("Hayir") option.

Mystery #1: Holding the referendum. The Turkish electorate voted on April 16 in a remarkable national plebiscite that dealt not with the usual topic � floating a bond or recalling a politician � but with fundamental constitutional changes affecting the very nature of their government: Should the country continue with the flawed democracy of the past 65 years or centralize political power in the presidency? Under the new dispensation, the prime minister vaporizes and the president holds vast power over parliament, the judiciary, the budget, and the military.

Turks generally saw the 18 proposed changes to the constitution as a momentous decision. Famed novelist Elif Åžafak spoke for most when she wrote that Turkey's referendum "could alter the country's destiny for generations to come." After the referendum passed, some of those opposed to it cried in the streets. "Turkey as we know it is over; it is history" wrote Yavuz Baydar, a journalist. Defense & Foreign Affairs assessed the referendum as perhaps "the most significant and transformative change in Eurasia, the Middle East, and parts of Africa since the collapse of the USSR in 1990-91."

Some Turks opposed to the referendum took their loss very hard.

But there's a catch: for years Erdoğan has held the powers the referendum gives him. He is the boss in Turkey who can bend the country to his wishes. Anyone � cartoonist, cafeteria manager, or Canadian � accused of "insulting the president" can be fined or jailed. A former prime minister or president who dares disagree with Erdoğan vanishes from public life. He alone makes war or peace. What Erdoğan wants, he gets, regardless of constitutional niceties.

ErdoÄŸan's fixation on officially imbuing the office of the presidency with the vast powers he already has in practice prompted him to steal an election, fire a prime minister, start a near-civil war with the Kurds, and provoke a crisis with Europe. Why did he bother with all this for a mere superfluity?

Mystery #2: The referendum results. ErdoÄŸan brought enormous pressure to bear for a momentous victory in the referendum. He made full use of his control of most media. Mosques were mobilized. In the words of one international organization, in several cases, "No" supporters "have faced police interventions while campaigning; a number were also arrested on charges of insulting the president or organizing unlawful public events." Opponents also lost their jobs, met with media boycotts, faced electricity outages, and got beaten up. A week before the referendum, ErdoÄŸan even announced that the "No" voters risk their afterlife. Then, according to a Swedish NGO, "widespread and systematic election fraud, violent incidents and scandalous steps taken by" the election board "overshadowed the voting."

Despite this, the referendum passed by a perplexingly meager 51.4 to 48.6 percent. Were it fairly conducted, why would Erdoğan take the chance of losing, thereby diminishing his stature and reducing his sway? Were the referendum fixed � entirely possible, given his party's record � why was the affirmative vote so low and not a more imposing 60, 80, or � why not � 99 percent? The unimpressive 51.4 percent majority virtually invited opposition parties, supported by the European Union and others, to challenge the legitimacy of the referendum, raising awkward questions that Erdoğan surely preferred not discussed.

Bashar al-Assad won Syria's "election" of 2014 with a satisfying 88.7 percent of the vote. But no one took it seriously.

Mystery #3: G�len: Erdoğan wantonly ended a key alliance with fellow-Islamist Fethullah G�len, transforming a stalwart ally into a determined domestic opponent who challenged Erdoğan's primacy and revealed his corruption. In his political war with G�len, an elderly Muslim cleric living in the Poconos of rural Pennsylvania, Erdoğan implausibly claimed that G�len's movement had planned and led an alleged coup attempt in July 2016; then he cracked down on G�len's followers and anyone else who met with his displeasure, leading to 47,000 arrests, 113,000 detainments, 135,000 firings or suspensions from jobs, and many, many more entering the shadows of "social death." Erdoğan went further, demanding that Washington extradite G�len to Turkey and threatening a rupture if he did not get his way: "Sooner or later the U.S. will make a choice. Either Turkey or [G�len]"

Why did Erdoğan pick a fight with G�len, creating turmoil within Turkish Islamist ranks and jeopardizing relations with the United States?

Mystery #4: Semantic purism. The European Union reluctantly agreed to visa-free travel for 75 million Turks to its huge Schengen Zone, a benefit that would potentially allow ErdoÄŸan to push out unwanted Kurds and Syrian refugees, not to speak of increasing his influence in countries like Germany and The Netherlands. But the EU made this access contingent on narrowing Turkey's vaguely worded anti-terrorism laws; it demanded "revising the legislation and practices on terrorism in line with European standards." ErdoÄŸan could have made this meaningless concession and arrested anyone he wanted on other charges, but he refused to ("It's impossible to revise the legislation and practices on terrorism," intoned one of his ministers) and forewent an extraordinary opportunity.

Mystery #5: Canny or megalomaniacal. ErdoÄŸan became prime minister in 2003 and for eight years governed cautiously, overseeing remarkable economic growth, mollifying the military leadership that held the country's ultimate power, and successfully pursuing a policy of "zero problems with neighbors." In contrast to the hapless Mohammed Morsi, who lasted just a year as president of Egypt, ErdoÄŸan timed his moves with such deftness that, for example, hardly anyone noticed in July 2011 when he subdued the military.

That was then. Since 2011, however, ErdoÄŸan repeatedly has fomented his own problems. He gratuitously turned Syria's Bashar al-Assad from his favorite foreign leader (the two and their wives once even vacationed together) into a mortal enemy. He shot down a Russian fighter plane then abjectly had to apologize. He lost out on a pipeline transporting eastern Mediterranean gas to Europe.

He illegally built himself on protected land an absurdly large palace, the largest in the world since Nicolae Ceausescu's disastrous People's Palace in Bucharest. In a particularly ignoble farce, ErdoÄŸan showed up at the funeral of American boxer Muhammad Ali to give a speech, deliver presents, and have his picture taken with family members, only to be rejected in all these requests and slink back home.

He makes enemies everywhere he goes. In Ecuador, ErdoÄŸan's bodyguards handcuffed three pro-Kurdish Ecuadorian women and roughed up a parliamentarian who tried to protect them. When asked about this incident, the deputy speaker of Ecuador's legislature replied, "Until ErdoÄŸan's bodyguards assaulted a deputy, our public was not aware of Turkey. Nobody knew who was a Turk or a Kurd. Now everybody knows and naturally we are on the side of the Kurds. We don't want to see ErdoÄŸan in our country again."

What happened to the cunning leader of a decade back?

ErdoÄŸan's Islamist supporters sometimes suggest that he's on his way to declaring himself caliph. As the hundredth anniversary of the Istanbul-based caliphate's abolition approaches, he may find this tempting; depending on whether he uses the Islamic or Christian calendar, that could happen, respectively, on either March 10, 2021 or March 4, 2024. You heard it here first.

Sadly, Western responses to Erdoğan have been confused and weak-kneed. Angela Merkel agreed to hauling comedian Jan B�hmermann into court for ridiculing Erdoğan. Donald Trump actually congratulated Erdoğan on his tyrannic victory and rewarded him with a meeting next month. And Australians defer on account of the Gallipoli commemorations.

Jan B�hmermann was dragged into court for making fun of Erdoğan on German television.

It's time to see Recep Tayyip ErdoÄŸan for the dictatorial, Islamist, anti-Western egomaniac he is, and protect his neighbors and ourselves from the damage he is already causing and the greater problems to come. Removing U.S. nuclear weapons from the Incirlik air base would be one step in the right direction; even better would be to put Ankara on notice that its active NATO membership is in jeopardy pending a dramatic turnaround in behavior.