Russia is running its military campaign against Ukraine out of Moscow, with no central war commander on the ground to call the shots, according to American officials who have studied the five-week-old war.

That centralized approach may go a long way to explain why the Russian war effort has struggled in the face of stiffer-than-expected Ukrainian resistance, the officials said.

The lack of a unifying military leader in Ukraine has meant that Russian air, ground and sea units are not in sync. Their disjointed battlefield campaigns have been plagued by poor logistics, flagging morale and between 7,000 and 15,000 military deaths, senior U.S. officials and independent analysts say.

It has also contributed to the deaths of at least seven Russian generals as high-ranking officers are pushed to the front lines to untangle tactical problems that Western militaries would leave to more junior officers or senior enlisted personnel.

A senior American official said that NATO officials and the intelligence community had spent weeks waiting for a Russian war commander to emerge. No one has, leaving Western officials to conclude that the men making decisions are far from the fight, back in Moscow: Defense Minister Sergei K. Shoigu; Gen. Valery Gerasimov, the chief of the general staff of the Russian military; and even President Vladimir V. Putin.

On Wednesday, Biden administration officials, citing declassified U.S. intelligence, said that Mr. Putin had been misinformed by his advisers about the Russian military’s problems in Ukraine. The intelligence, American officials said, also showed what appeared to be growing tension between Mr. Putin and Mr. Shoigu, who was once among the most trusted members of the Kremlin’s inner circle.

Russian officials have disputed the American intelligence assertion, with the Kremlin on Thursday calling it a “complete misunderstanding” of the situation that could have “bad consequences.”

But it is hard to run a military campaign from 500 miles away, U.S. military officials said. The distance alone, they said, can lead to a disconnect between the troops who are doing the fighting and the war plans being drawn up in Moscow. Instead of streamlining the process, they said, Russia has created a military machine that is unable to adapt to a quick and nimble Ukrainian resistance.

A second senior American official said that Russian soldiers, who have been taught not to make a single move without explicit instructions from superiors, had been left frustrated on the battlefield, while Mr. Putin, Mr. Shoigu and General Gerasimov continued to plot increasingly out-of-touch strategy.

This top-down approach means that Moscow transmits instructions to generals in the field, who then transmit them to troops, who are told to follow those instructions no matter the situation on the ground.

“It shows up in the mistakes that are being made,” said retired Gen. Wesley K. Clark, who served as NATO’s supreme allied commander for Europe during the Kosovo war.

Last week, Ukrainian forces blew up the Russian warship Orsk, which had docked in southern Ukraine. Describing the incident, General Clark asked: “Who would be crazy enough to dock a ship in a port” before first securing the area?

That the Russian planners who sent the Orsk into the port were inattentive to the potential danger shows that no one is questioning decisions coming from the top, officials said. The troops at the bottom are not empowered to point out flaws in strategy that should be obvious, they said.

Military analysts said a complex chain of events, originating with a broken-down command structure that begins in Moscow, had led to the deaths of the Russian generals.

“I do not see the kind of coherent organizational architecture that one would have expected given the months of exercises and presumably even longer period of planning in advance of the invasion,” retired Gen. David H. Petraeus, who served as the head of the military’s Central Command and as the top commander in Iraq and Afghanistan, said in an email.

In an American war command structure, a four-star field commander would coordinate and synchronize all subordinate air, land and naval forces, as well as special operations and cyberoperations. The campaign would have a main objective, a center of gravity, with operations supporting that goal.

In the case of the deaths of some of the Russian generals, for instance, the problem originated far away from the battlefield, when Moscow did not respond quickly enough after Ukraine jammed Russian communications, the analysts said.

Mr. Putin’s own dishonest portrayal of the mission of the Russian military may have hurt its ability to prosecute the effort, which the Russian president initially presented publicly as a limited military operation.