WASHINGTON — Turkey’s president, Recep Tayyip Erdogan, wants more than control over a wide swath of Syria along his country’s border. He says he wants the Bomb.

In the weeks leading up to his order to launch the military across the border to clear Kurdish areas, Mr. Erdogan made no secret of his larger ambition. “Some countries have missiles with nuclear warheads,” he told a meeting of his ruling party in September. But the West insists “we can’t have them,” he said. “This, I cannot accept.”

With Turkey now in open confrontation with its NATO allies, having gambled and won a bet that it could conduct a military incursion into Syria and get away with it, Mr. Erdogan’s threat takes on new meaning. If the United States could not prevent the Turkish leader from routing its Kurdish allies, how can it stop him from building a nuclear weapon or following Iran in gathering the technology to do so?

It was not the first time Mr. Erdogan has spoken about breaking free of the restrictions on countries that have signed the Nuclear Nonproliferation Treaty, and no one is quite sure of his true intentions. The Turkish autocrat is a master of keeping allies and adversaries off balance, as President Trump discovered in the past two weeks.

“The Turks have said for years that they will follow what Iran does,” said John J. Hamre, a former deputy secretary of defense who now runs the Center for Strategic and International Studies in Washington. “But this time is different. Erdogan has just facilitated America’s retreat from the region.”

“Maybe, like the Iranians, he needs to show that he is on the two-yard line, that he could get a weapon at any moment,” Mr. Hamre said.

If so, he is on his way — with a program more advanced than that of Saudi Arabia, but well short of what Iran has assembled. But experts say it is doubtful that Mr. Erdogan could put a weapon together in secret. And any public move to reach for one would provoke a new crisis: His country would become the first NATO member to break out of the treaty and independently arm itself with the ultimate weapon.

Already Turkey has the makings of a bomb program: uranium deposits and research reactors — and mysterious ties to the nuclear world’s most famous black marketeer, Abdul Qadeer Khan of Pakistan. It is also building its first big power reactor to generate electricity with Russia’s help. That could pose a concern because Mr. Erdogan has not said how he would handle its nuclear waste, which could provide the fuel for a weapon. Russia also built Iran’s Bushehr reactor.

Experts said it would take a number of years for Turkey to get to a weapon, unless Mr. Erdogan bought one. And the risk for Mr. Erdogan would be considerable.

“Erdogan is playing to an anti-American domestic audience with his nuclear rhetoric, but is highly unlikely to pursue nuclear weapons,” said Jessica C. Varnum, an expert on Turkey at Middlebury’s James Martin Center for Nonproliferation Studies in Monterey, Calif. “There would be huge economic and reputational costs to Turkey, which would hurt the pocketbooks of Erdogan’s voters.”

“For Erdogan,” Ms. Varnum said, “that strikes me as a bridge too far.”

There is another element to this ambiguous atomic mix: The presence of roughly 50 American nuclear weapons, stored on Turkish soil. The United States had never openly acknowledged their existence, until Wednesday, when Mr. Trump did exactly that.

Asked about the safety of those weapons, kept in an American-controlled bunker at Incirlik Air Base, Mr. Trump said, “We’re confident, and we have a great air base there, a very powerful air base.”

But not everyone is so confident, because the air base belongs to the Turkish government. If relations with Turkey deteriorated, the American access to that base is not assured.

Turkey has been a base for American nuclear weapons for more than six decades. Initially, they were intended to deter the Soviet Union, and were famously a negotiating chip in defusing the 1962 Cuban Missile Crisis, when President John F. Kennedy secretly agreed to remove missiles from Turkey in return for Moscow doing the same in Cuba.

But tactical weapons have remained. Over the years, American officials have often expressed nervousness about the weapons, which have little to no strategic use versus Russia now, but have been part of a NATO strategy to keep regional players in check — and keep Turkey from feeling the need for a bomb of its own.

When Mr. Erdogan put down an attempted military coup in July 2016, the Obama administration quietly drew up an extensive contingency plan for removing the weapons from Incirlik, according to former government officials. But it was never put in action, in part because of fears that removing the American weapons would, at best, undercut the alliance, and perhaps give Mr. Erdogan an excuse to build his own arsenal.

For decades, Turkey been hedging its bets. Starting in 1979, it began operating a few small research reactors, and since 1986, it has made reactor fuel at a pilot plant in Istanbul. The Istanbul complex also handles spent fuel and its highly radioactive waste.

“They’re building up their nuclear expertise,” Olli Heinonen, the former chief inspector for the International Atomic Energy Agency, said in an interview. “It’s high quality stuff.”

He added that Ankara might “come to the threshold” of the bomb option in four or five years, or sooner, with substantial foreign help. Mr. Heinonen noted that Moscow is now playing an increasingly prominent role in Turkish nuclear projects and long-range planning.

Turkey’s program, like Iran’s, has been characterized as an effort to develop civilian nuclear power.

Russia has agreed to build four nuclear reactors in Turkey, but the effort is seriously behind schedule. The first reactor, originally scheduled to go into operation this year, is now seen as starting up in late 2023.

The big question is what happens to its spent fuel. Nuclear experts agree that the hardest part of bomb acquisition is not coming up with designs or blueprints, but obtaining the fuel. A civilian nuclear power program is often a ruse for making that fuel, and building a clandestine nuclear arsenal.

Turkey has uranium deposits — the obligatory raw material — and over the decades has shown great interest in learning the formidable skills needed to purify uranium as well as to turn it into plutonium, the two main fuels of atom bombs. A 2012 report from the Carnegie Endowment for International Peace, “Turkey and the Bomb,” noted that Ankara “has left its nuclear options open.”

Hans Rühle, the head of planning in the German Ministry of Defense from 1982 to 1988, went further. In a 2015 report, he said “the Western intelligence community now largely agrees that Turkey is working both on nuclear weapon systems and on their means of delivery.”

In a 2017 study, the Institute for Science and International Security, a private group in Washington that tracks the bomb’s spread, concluded that Mr. Erdogan’s efforts to consolidate power and raise Turkey’s regional status were increasing “the risk that Turkey will seek nuclear weapons capabilities.”

In response to the German assertion and other similar assessments, Turkey has repeatedly denied a secret nuclear arms effort, with its foreign ministry noting that Turkey is “part of NATO’s collective defense system.”

But Mr. Erdogan’s recent statements were notable for failing to mention NATO, and for expressing his long-running grievance that the country has been prohibited from possessing an arsenal of its own. Turkey has staunchly defended what it calls its right under peaceful global accords to enrich uranium and reprocess spent fuel, the critical steps to a bomb the Trump administration is insisting Iran must surrender.

Turkey’s uranium skills were highlighted in the 2000s when international sleuths found it to be a covert industrial hub for the nuclear black market of Mr. Khan, a builder of Pakistan’s arsenal. The rogue scientist — who masterminded the largest illicit nuclear proliferation ring in history — sold key equipment and designs to Iran, Libya and North Korea.

The most important items were centrifuges. The tall machines spin at supersonic speeds to purify uranium, and governments typically classify their designs as top secret. Their output, depending on the level of enrichment, can fuel reactors or atom bombs.

According to “Nuclear Black Markets,” a report on the Khan network by the International Institute for Strategic Studies, a London think tank, companies in Turkey aided the covert effort by importing materials from Europe, making centrifuge parts and shipping finished products to customers.

A riddle to this day is whether the Khan network had a fourth customer. Dr. Rühle, the former German defense official, said intelligence sources believe Turkey could possess “a considerable number of centrifuges of unknown origin.” The idea that Ankara could be the fourth customer, he added, “does not appear far-fetched.” But there is no public evidence of any such facilities.

What is clear is that in developing its nuclear program, Turkey has found a partner: President Vladimir V. Putin of Russia. In April 2018, Mr. Putin traveled to Turkey to signal the official start of construction of a $20 billion nuclear plant on the country’s Mediterranean coast.

Part of Russia’s motivation is financial. Building nuclear plants is one of the country’s most profitable exports. But it also serves another purpose: Like Mr. Putin’s export of an S-400 air defense system to Ankara — again, over American objections — the construction of the plant puts a NATO member partly in Russia’s camp, dependent on it for technology.

David E. Sanger reported from Washington, and William J. Broad from New York.

David E. Sanger is a national security correspondent. In a 36-year reporting career for The Times, he has been on three teams that have won Pulitzer Prizes, most recently in 2017 for international reporting. His newest book is “The Perfect Weapon: War, Sabotage and Fear in the Cyber Age.” @SangerNYT • Facebook

William J. Broad is a science journalist and senior writer. He joined The Times in 1983, and has shared two Pulitzer Prizes with his colleagues, as well as an Emmy Award and a DuPont Award. @WilliamJBroad

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