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For years, the United States tried to stem the spread of Islamic militancy in the region by conducting its most ambitious counterterrorism program ever across these vast, turbulent stretches of the Sahara.

But as insurgents swept through the desert last year, commanders of this nation's elite army units, the fruit of years of careful American training, defected when they were needed most — taking troops, guns, trucks and their newfound skills to the enemy in the heat of battle, according to senior Malian military officials.

"It was a disaster," said one of several senior Malian officers to confirm the defections.

Then an American-trained officer overthrew Mali's elected government, setting the stage for more than half of the country to fall into the hands of Islamic extremists. American spy planes and surveillance drones have tried to make sense of the mess, but American officials and their allies are still scrambling to get a detailed picture of who they are even up against.

Now, in the face of longstanding American warnings that a Western assault on the Islamist stronghold could rally jihadists around the world and prompt terrorist attacks as far away as Europe, the French have entered the war themselves.

First, they blunted an Islamist advance, saying the rest of Mali would have fallen into the hands of militants within days. Then on Sunday, French warplanes went on the offensive, going after training camps, depots and other militant positions far inside Islamist-held territory in an effort to uproot the militants, who have formed one of the largest havens for jihadists in the world.

Some Defense Department officials, notably officers at the Pentagon's Joint Special Operations Command, have pushed for a lethal campaign to kill senior operatives of two of the extremists groups holding northern Mali, Ansar Dine and Al Qaeda in the Islamic Maghreb. Killing the leadership, they argued, could lead to an internal collapse.

But with its attention and resources so focused on other conflicts in places like Pakistan, Yemen, Somalia and Libya, the Obama administration has rejected such strikes in favor of a more cautious, step-back strategy: helping African nations repel and contain the threat on their own.

Over the last four years, the United States has spent between $520 million and $600 million in a sweeping effort to combat Islamist militancy in the region without fighting the kind of wars it has waged in the Middle East. The program stretched from Morocco to Nigeria, and American officials heralded the Malian military as an exemplary partner. American Special Forces trained its troops in marksmanship, border patrol, ambush drills and other counterterrorism skills.

But all that deliberate planning collapsed swiftly when heavily armed, battle-hardened Islamist fighters returned from combat in Libya. They teamed up with jihadists like Ansar Dine, routed poorly equipped Malian forces and demoralized them so thoroughly that it set off a mutiny against the government in the capital, Bamako.

A confidential internal review completed last July by the Pentagon's Africa Command concluded that the coup had unfolded too quickly for American commanders or intelligence analysts to detect any clear warning signs.

"The coup in Mali progressed very rapidly and with very little warning," said Col. Tom Davis, a command spokesman. "The spark that ignited it occurred within their junior military ranks, who ultimately overthrew the government, not at the senior leadership level where warning signs might have been more easily noticed."

But one Special Operations Forces officer disagreed, saying, "This has been brewing for five years. The analysts got complacent in their assumptions and did not see the big changes and the impacts of them, like the big weaponry coming out of Libya and the different, more Islamic" fighters who came back.