MOSCOW, April 10 (Reuters) - Russia's forces kept up a barrage of attacks along the front concentrated in two Ukrainian cities in the eastern Donetsk region, Ukraine's military reported, as Kyiv said it repelled more than 40 enemy strikes over the past 24 hours.

Fighting was heaviest along the western approaches to Bakhmut, the general staff of Ukraine's armed forces said on Sunday, one of the two cities in the east, along with Avdiivka, that Russia's military has been targeting.

Russian forces have been besieging Bakhmut for months in the longest battle in more than a year of war.

In a nightly weekend video address, Ukraine President Volodymyr Zelenskiy denounced Russian air strikes coinciding with the observance of Orthodox Palm Sunday, saying Moscow was further isolating itself from the world.

Ukraine's State Emergencies Service said a 50-year-old man and his daughter, 11, were killed after Russian forces struck a residential building in Zaporizhzhia, in the southeast.

A woman identified as the wife and mother of the victims was pulled from under the rubble.

"This is how the terrorist state marks Palm Sunday," Zelenskiy said in his address. "This is how Russia places itself in even greater isolation from the world."

He praised several units defending positions in the east and said he hoped Palm Sunday next year "will take place with peace and freedom for all our people".

The majority of Ukraine's 41 million people are Orthodox Christians who celebrate Easter a week from now.

Pope Francis, who has been critical of Russia's war, prayed for peace during Easter events in the Vatican: "Help the beloved Ukrainian people on their journey towards peace, and shed the light of Easter upon the people of Russia."

Russia's defence ministry said its forces had destroyed a depot with 70,000 tonnes of fuel near Zaporizhzhia.

The forces had destroyed Ukrainian army warehouses storing missiles, ammunition and artillery in the regions of Zaporizhzhia and Donetsk, the ministry added.

Reuters could not verify the battlefield reports.