The U.S. Defense Department has observed Russian forces stalling out in their advance as well as anecdotal instances of sagging morale among the troops.

A senior U.S. defense official hesitated to comment on the broad morale of the Russian forces, but he acknowledged some "anecdotal indications" that morale is "not high in some units."

AMERICAN CITIZEN KILLED IN UKRAINE, STATE DEPARTMENT SAYS: LIVE UPDATES

"Some of that is, we believe, a function of poor leadership, lack of information that the troops are getting about their mission and objectives, and I think disillusionment from being resisted as fiercely as they have been," the official explained. "But, again, I want to stress that these are anecdotal accounts."

Russian-made multiple rocket launchers "Smerch," front, and "Uragan," behind it, at a display on the first day of Moscow's International III Arms Exhibition in Moscow, Wednesday, Aug. 20, 2008. The Russian invasion of Ukraine is the largest conflict that Europe has seen since World War II, with Russia conducting a multi-pronged offensive across the country. The Russian military has pummeled wide areas in Ukraine with air strikes and has conducted massive rocket and artillery bombardment resulting in massive casualties. (AP Photo, File) (AP Photo)

An armed man stands by the remains of a Russian military vehicle in Bucha, close to the capital Kyiv, Ukraine, Tuesday, March 1, 2022. Russia on Tuesday stepped up shelling of Kharkiv, Ukraine's second-largest city, pounding civilian targets there. Casualties mounted and reports emerged that more than 70 Ukrainian soldiers were killed after Russian artillery recently hit a military base in Okhtyrka, a city between Kharkiv and Kyiv, the capital. ((AP Photo/Serhii Nuzhnenko))

"While we’re confident in what we’re picking up, we would not apply that to the entire force that Russia has put into Ukraine," the official added.

RUSSIA INTENDS TO GO FURTHER THAN UKRAINE, MUST STOP ‘DIPLOMACY OF DECEPTION’: FORMER FOREIGN MINISTER

Reports over the past week have indicated a significant slowdown in Russian advance, which may contribute to the anecdotal low morale: Officials have not seen Russia move its artillery "any closer" to Kyiv, but that all signs indicate that the forces intend to conduct a siege of the city.

"That’s what you want to use artillery for, and so we haven’t seen that manifest itself," the senior defense official told reporters Thursday. "We’re just seeing them move them into place, but they clearly are trying, particularly around Kyiv, to improve their ability to hit the city from afar with munitions."

SWITCHBLADE DRONES US SENDING TO UKRAINE MAY BE ‘GAME CHANGERS’

Additionally, defense officials have seen no changes in either air superiority or indication of an imminent amphibious invasion.

"We haven’t seen any major changes by either Air Force in terms of how much they’re flying, but I just don’t have the numbers," the official said, but added that other officials had seen "several surface ships, about a half a dozen or so surface ships off the coast not far from Odesa."

CLICK HERE TO GET THE FOX NEWS APP

"They are definitely at sea and not far from Odesa, but it’s unclear right now what they’re planning to do, what they’re preparing to do," the defense official said. "We got frigates, a couple of vantage sips, one warfare ship … but we’re not seeing imminent activity that would indicate that they’re about to launch an amphibious assault on Odesa."

Russian artillery closing in on Kyiv for siege, US says, with troop morale flagging

Pentagon also observed no signs of imminent water assault on Odesa