Unlock stock picks and a broker-level newsfeed that powers Wall Street.
WRAPUP 11-Ukrainian defenders hold out in Donbas city under heavy fire

* Russian forces pour resources into battle

* City of Sievierodonetsk under assault

* Ukraine pleads for more weapons from West

* EU cannot agree on Russian oil embargo; more talks Monday

By Max Hunder and Mari Saito

KYIV/KHARKIV, Ukraine, May 29 (Reuters) - Russian forces intensified their attacks with barrages of heavy artillery to capture a key Ukrainian city in the southeastern region of Donbas, whose full takeover Moscow's top diplomat said was now an "unconditional priority".

Constant Russian shelling has destroyed all of the critical infrastructure in Sievierodonetsk, the largest city Ukraine still controls in Luhansk, one of the regions in Donbas, Ukrainian President Volodymyr Zelenskiy said, while pledging to do everything to hold off the advance.

"Some 90% of buildings are damaged. More than two-thirds of the city's housing stock has been completely destroyed. There is no telecommunication," he said in a televised speech.

"Capturing Sievierodonetsk is a fundamental task for the occupiers ... We do all we can to hold this advance," he added.

The "liberation" of the Donbas, an industrial region which includes Luhansk and Donetsk, is an "unconditional priority" for Russia, Foreign Minister Sergei Lavrov said on Sunday.

In a Facebook post, Ukrainian forces in the Donbas said they had been on the defensive all day on Sunday. Russian forces fired on 46 communities in the Donetsk and Luhansk regions, killing at least three civilians, wounding two others or destroying or damaging 62 civilian buildings.

Russian shelling also continued across several regions such as in Novy Buh in Mykolaiv and Sumy. The city council in Novy Buh in Mykolaiv region in southern Ukraine said on its Telegram channel that a Russian missile attack had caused considerable damage in the city centre.

The battle for Sievierodonetsk, which lies on the eastern bank of the Siverskyi Donets River, is in the spotlight as Russia ekes out slow but solid gains in the part of the country close to the Russian border.

Having failed to take the capital Kyiv in the early phase of the war, Russia is seeking to consolidate its grip on the Donbas, large parts of which are already controlled by Moscow-backed separatists.

It has concentrated huge firepower on a small area - a contrast to earlier phases of the conflict when its forces were often spread thinly - bludgeoning towns and cities with artillery and air strikes.

The Ukrainian government meanwhile urged the West to provide it with more longer-range weapons in order to turn the tide in the war, now in its fourth month. Zelenskiy voiced hopes that the weapons would be provided and that he expected "good news" in the coming days.