Ukrainian government troops have taken over a large part of the rebel-held city of Luhansk, an official said Wednesday, after days of street battles.

Andriy Lysenko, a spokesman for Ukraine's National Security Council, told reporters Wednesday in Kiev that government forces are now controlling "significant parts" of the eastern city.

Hard-hit Luhansk has been without electricity, running water or phone connections for 18 days due to the fighting. Russia has sent a massive aid convoy to help the residents there but it has not yet received Kiev's approval, because the proposed route lies through rebel-held territory.

Residents are reported to be standing in lines to buy bread baked on portable generators as food grows scarce.

Government troops Wednesday also fought to gain control of the rebel-held city of Donetsk and a key highway in eastern Ukraine in battles that left 34 residents and nine troops dead in just 24 hours, authorities said.

Several neighborhoods in Donetsk -- the largest city still in rebel hands -- have been hit with artillery fire in the last few days and fighting on the outskirts has become more intense.

The Kiev-backed administration in Donetsk quoted the death toll of 34 local residents killed and 29 wounded as of noon Wednesday, a figure it said did not include any government troop deaths.

Earlier, a Ukrainian official said nine troops were killed and 22 wounded in overnight fighting in Ilovaysk, a town near Donetsk, as the government sought to retake a major railroad and a highway that leads to Russia.

Lysenko said fighting continued in Ilovaysk on Wednesday even though government forces have gained overall control over it.

Among those killed in Ilovaysk was a Ukrainian-American known by the nom de guerre of "Franko," said Anton Herashchenko, an adviser to the interior minister. He said Franko was an American citizen with a military background who had been living in eastern Ukraine for the past 10 years and obtained Ukrainian citizenship before joining the battalion.

For several weeks running, Donetsk has come under sustained shelling attacks from all sides. The imprecision of the shelling is creating much animosity while seemingly taking a limited toll on rebel forces.

On Wednesday morning, rockets slammed into residential areas, including the suburb of Makiivka.

"I was with my grandmother in the bathroom, because there is a bearing wall in there," said Anna Zyukova, 22. "And then all of sudden, bam-bam."

Many residents have been taking refuge in improvised bomb shelters in apartment building basements. Residents in Makiivka huddled in groups near one such shelter Wednesday, chatting and listening as rockets flew in and out several miles away.

At a rebel camp by a checkpoint closer to the fighting, a rebel commander who identified himself only as "Chaika" -- Russian for seagull -- said he was at a loss to explain why army shells were hitting apartments.

"We purposely don't take up positions where people live," he said -- a claim that Ukrainian officials have repeatedly dismissed.

The Kiev government has pursued diplomatic efforts to resolve the conflict, which the United Nations says has killed more than 2,000 people and displaced over 340,000 since fighting began in mid-April.

Ukrainian President Petro Poroshenko will host German Chancellor Angela Merkel this weekend in Kiev before meeting next week with Russian President Vladimir Putin in Minsk, the capital of Belarus.

Ukraine has accused Russia of arming and supporting the rebels, a charge that Russia denies.  The fighting began a month after Russia annexed Ukraine's Black Sea peninsula of Crimea.

In Moscow on Wednesday, protesters scaled one of the city's famed Stalin-era skyscrapers and painted the Soviet star on its spire in the national colors of Ukraine. They also attached a yellow-and-blue Ukrainian flag to the top of the 580-foot building.

While Moscow police detained four suspects and charged them with vandalism, a crime punishable with up to three years in prison, Poroshenko, the Ukrainian president, welcomed the flag-hoisting over the skyscraper in a video message, calling it a "symbolic" gesture.

The Associated Press contributed to this report.