WRAPUP 10-Russian forces hammer Ukraine's Bakhmut in quest for breakthrough in war

(Adds Ukraine military evening statement on Bakhmut, other areas)

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Early spring thaw turns eastern battlefields to mud

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Russian forces advance north and south of Bakhmut

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Kremlin: Kyiv must accept loss of lands annexed by Russia

By Dan Peleschuk

KYIV, Feb 28 (Reuters) - Russian forces on Tuesday pressed forward their weeks-long drive to encircle and capture the eastern Ukrainian city of Bakhmut, where the Ukrainian military described the attacks as constant.

Taking Bakhmut, the scene of some of the year-long war's bloodiest battles, would be Russia's first major prize in more than six months. It would open the way to seizing the last remaining urban centres in the Donetsk region, one of four Moscow claims to have annexed.

"In the Bakhmut sector, the enemy is launching offensive action and is continuously attacking Bakhmut," said the regular evening statement by the General Staff of the Ukrainian Armed Forces.

While most of the Russian attacks were focused on Bakhmut and other towns and villages in Donetsk province, the statement said Russian forces shelled more than 20 settlements in northern regions near the Russian border: Chernihiv, Sumy and Kharkiv.

Ukrainian aircraft launched three strikes on areas of concentration of Russian forces, the statement said.

Reuters was not able to verify battlefield reports.

Russian President Vladimir Putin instructed the FSB security service to bolster security in the four regions Moscow claims to have annexed and also to counter espionage and sabotage operations against Russia by Ukraine and the West.

He was speaking after a Russian regional governor said a drone had crashed near a natural gas distribution station on Tuesday in an apparent failed attack near the town of Kolomna, just 110 km (68 miles) southeast of Moscow.

Ukraine does not publicly claim responsibility for attacks inside Russia. If it was behind the Kolomna incident, it would be its closest attempted drone strike to the Russian capital.

Earlier, Russia's defence ministry also accused Ukraine of launching two attempted drone attacks against two southern Russian regions overnight but said they caused no damage.

'CITY IS ON FIRE'

Around Bakhmut, Russian troops, including mercenary fighters from the Wagner Group, were trying to cut the Ukrainian defenders' supply lines and force them to surrender or withdraw.

"Despite significant losses, the enemy threw in the most prepared assault units of Wagner, who are trying to break through the defences of our troops and surround the city," Colonel General Oleksandr Syrskyi, commander of Ukraine's ground forces, said in a statement.