Moscow appeared to blame its own troops Wednesday for the deadly strike that hit its military barracks just after midnight on New Year’s Day, saying banned cellphone use alerted Ukrainian forces to the barrack’s location.

The deadliest known assault on Russian forces since the war began occurred at 12:01 a.m. on New Year’s Day in the city of Makiyivka in the hard-fought Donetsk region.

"It has already become obvious at present that the main cause of the occurrence was activation and large-scale use, contrary to the ban, of personal phones by personnel within the reach of enemy’s destruction means," Lt. Gen. Sergey Sevryukov told Russian media outlets Wednesday. "This factor enabled the enemy to take the bearing and determine coordinates of servicemen location to deliver a missile strike. 

"Required measures are being taken at present to exclude such tragic incidents in the future," he added. 

Ukrainian oil depot

Vehicles are seen in flames at an oil depot after missiles struck the facility in an area controlled by Russian-backed separatist forces in Makiivka, eastern Ukraine, on Wednesday, May 4, 2022. (AP)

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The death toll from the strike on the barracks – located some 50 miles south of Bakhmut where intense warfare has raged for months – has also risen according to the Russian defense ministry. 

In an unusual admission of wartime deaths, the toll jumped from 63 soldiers killed in the attack according to the Russian ministry earlier this week to 89 on Wednesday. 

Sevryukov told Russian outlets that medical aid was immediately provided but that "regrettably, the death toll of our comrades increased to 89 when removing structural steel debris."

Donetsk

Emergency service workers extinguish a fire after shelling on the Bakhmut frontline in Ivanivske, Ukraine as Russia-Ukraine war continues on Jan. 2, 2023. (Diego Herrera Carcedo/Anadolu Agency via Getty Images)

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The Wall Street Journal reported that the regiment’s deputy commander was also killed in the strike.

Ukrainian officials have claimed the strike – which used U.S.-supplied HIMARS to hit the barracks – killed as many as 400 and injured hundreds more, though Fox News Digital could not independently verify these figures. 

Sevryukov said an investigation had been opened into the circumstances that allowed for the successful sneak attack in Donetsk. 

HIMARS

This photo shows the M142 High Mobility Artillery Rocket System firing during the Combined Arms Live Fire Exercise as part of the annual naval exercises between the Philippine Marine Corps and U.S. Marine Corps at Capas, Tarlac province on Oct. 13, 2022.  (JAM STA ROSA/AFP via Getty Images)

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Ukrainian President Volodymyr Zelenskyy warned Tuesday that Russia is planning a counter assault in an attempt to change the tone of the war as Russian forces struggle to hold ground or gain momentum. 

"We have no doubt that the current masters of Russia will throw everything they have left and everyone they can muster to try to turn the tide of the war and at least postpone their defeat," he said in his overnight address.