Ukrainian military personnel are fortifying their positions around the eastern city of Sloviansk in expectation of a fresh Russian attempt to seize the strategic point in the fiercely fought-over Donetsk region.

As heavy ground fighting continues on the front line only miles to the east, southeast and north of Sloviansk, members of the Dnipro-1 Regiment are digging in after a week of relative calm. The last Russian strike on the city occurred on July 30.

While the lull provided Sloviansk's remaining residents a reprieve after regular shellings between April and July, some unit members say it could be a prelude to renewed attacks.

“I think it won't be calm for long. Eventually, there will be an assault,” Col Yurii Bereza, the head of the volunteer national guard regiment, told The Associated Press on Friday, adding that he expected the area to get “hot” in the coming days. Sloviansk is considered a strategic target in Moscow's ambitions to seize all of Donetsk province, a largely Russian-speaking area in eastern Ukraine where Russian forces and pro-Moscow separatists control about 60% of the territory.

Donetsk and neighbouring Luhansk province, which Russia has almost entirely captured since Ukrainian forces withdrew in early July from the remaining cities under their control, together make up the industrial Donbas region. The separatists have claimed the region as two independent republics since 2014, and Russian President Vladimir Putin recognised their sovereignty before he sent troops into Ukraine.

Seizing Sloviansk would put more of the region under Russian control, but it also would be a symbolic victory for Moscow. The city was the first to be taken by the separatists during an outbreak of hostilities between Russia and Ukraine in 2014, though it was later brought back under Ukrainian control.