By Pavel Polityuk
KYIV&nbsp;(Reuters) - Russian forces pressed attacks on frontline cities in eastern&nbsp;Ukraine&nbsp;on Monday, while Ukrainian officials played down a report that&nbsp;Kyiv&nbsp;is amending some plans for a&nbsp;counter-offensive&nbsp;due to a&nbsp;leak&nbsp;of classified U.S. documents.
The Russians were pounding Ukrainian positions around besieged Bakhmut in the eastern Donetsk region and other cities and towns with air strikes and artillery barrages,&nbsp;Kyiv&nbsp;said.
"The enemy switched to so-called scorched earth tactics from Syria. It is destroying buildings and positions with air strikes and artillery fire," Colonel General Oleksandr Syrskyi, commander of&nbsp;Ukraine's ground forces, said of Bakhmut.
The small and now largely ruined city on the edge of a chunk of Russian-controlled territory in Donetsk has for months been the biggest battleground of the war.
The head of the Moscow-controlled part of Donetsk, Denis Pushilin, said Russian forces now held 75% of the city.
Moscow's military was also targeting the city of Avdiivka.
"The Russians have turned Avdiivka into a total ruin," said Pavlo Kyrylenko, Donetsk's regional governor, describing an air strike on Monday that destroyed a multi-storey building.
"In total, around 1,800 people remain in Avdiivka, all of whom risk their lives every day."
In Chasiv Yar, the first major town to Bakhmut's west, few buildings are left intact and locals lining up to collect food and other aid do not even flinch at the sound of artillery.
"It used to be scarier but now we have got used to it," said 50-year-old humanitarian volunteer Maksym. "You don't even pay attention," he added, his words nearly drowned out by the sound of explosions.
As the&nbsp;battles&nbsp;ground on, U.S. media outlet CNN&nbsp;reported&nbsp;that&nbsp;Ukraine&nbsp;was forced to amend some military plans ahead of its long-anticipated&nbsp;counter-offensive&nbsp;because of the&nbsp;leak&nbsp;of dozens of secret documents.
U.S. officials are trying to trace the source of the&nbsp;leak, reviewing how they share secrets internally and dealing with the diplomatic fallout.
The documents detail topics including information on the&nbsp;Ukraine&nbsp;conflict, in which Washington has supplied&nbsp;Kyiv&nbsp;with huge amounts of weapons and led international condemnation of Moscow's invasion.
Asked about the report, Ukrainian presidential aide Mykhailo Podolyak said&nbsp;Kyiv's strategic plans remained unchanged but that specific tactics were always subject to change.
The secretary of the National Security and Defense Council, Oleksiy Danilov, told Reuters: "The opinion of people who have nothing to do with this do not interest us... The circle of people who possess information is extremely restricted."
Some national security experts and U.S. officials have said they suspect the&nbsp;leaker could be American, but have not ruled out pro-Russian actors.
Kremlin spokesman Dmitry Peskov declined to comment on the&nbsp;leak, but said: "There is in fact a tendency to always blame everything on Russia. It is, in general, a disease."
HOT ON THE EASTERN FRONT
A Ukrainian&nbsp;counter-offensive&nbsp;has long been expected&nbsp;after&nbsp;months of attritional warfare in the east.
A Russian winter&nbsp;offensive&nbsp;failed to make much progress and its troops have been bogged down in a series of&nbsp;battles&nbsp;where advances have been incremental and come at a huge cost.
The Ukrainian defenders have also taken heavy casualties.
Syrskyi said Moscow was sending in special forces and airborne units to help their attack on Bakhmut as members of Russia's private mercenary Wagner group, who have spearheaded the Bakhmut assault, were exhausted.
Reuters could not verify the battlefield accounts.
Ukraine's general staff said Russian forces had made unsuccessful advances on areas west of Bakhmut and at least 10 towns and villages had come under Russian shelling, including Bakhmut and Chasiv Yar.
Donetsk is one of four provinces in eastern and southern&nbsp;Ukraine&nbsp;that Russia declared annexed last year and is seeking to fully occupy in what appears to be a shift in its war aims&nbsp;after&nbsp;failing to overrun the country&nbsp;after&nbsp;its February 2022 invasion.
Control of Bakhmut could allow Russia to directly target Ukrainian defensive lines in Chasiv Yar and open the way for its forces to advance on two bigger cities in the Donetsk region - Kramatorsk and Sloviansk.
While&nbsp;Ukraine&nbsp;has said it wants to inflict as many casualties as possible on the Russian forces as its prepares its own&nbsp;counteroffensive, President Volodymyr Zelenskiy last week said troops could be withdrawn if they risked being encircled.
In addition to shelling Avdiivka, Russian forces targeted the towns of Maryinka and Kranohorivka to its southwest as well as Vuhledar, a hilltop town further south subject to Russian attacks for several weeks,&nbsp;Ukraine's general staff said.
Elsewhere, Russia's defence ministry said its forces destroyed a depot with 70,000 tonnes of fuel near Zaporizhzhia, and&nbsp;Ukraine&nbsp;reported&nbsp;widespread Russian shelling in northern regions. Officials in the south said Russian aircraft had used guided bombs against towns in the Kherson region.
In a rare coordination between the warring parties, Russia and&nbsp;Ukraine&nbsp;carried out another prisoner swap, with 106 Russian captives freed in exchange for 100 Ukrainians.
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(Additional reporting by Ron Popeski, Nick Starko and Tom Balmforth; Writing by Angus MacSwan, Andrew Cawthorne and Arshad Mohammed, Editing by Gareth Jones and Rosalba O'Brien)

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Ukraine battles rage, Kyiv reported to rethink counter-offensive after leak