By Simone McCarthy, Joshua Berlinger, Laura Smith-Spark, Adrienne Vogt and Joe Ruiz, CNN

From CNN's Niamh Kennedy in London 

Ukrainian President Volodymyr Zelensky has promised that Donbas will be "Ukrainian again," as Russian forces continue to make incremental gains in the southeastern region. 

Speaking during his nightly address Friday, Zelensky called the current situation in Donbas "very difficult," referencing Russia's ramping up of firepower and manpower in the region. 

The US Defense Department maintained during a press briefing Friday that Russia is continuing to make "incremental gains" in Donbas. 

Ukraine continues to call on international partners, including the United Kingdom, to provide it with multiple launch rocket systems to counter the Russian offensive. 

While acknowledging Ukraine's request, Pentagon press secretary John Kirby stressed during Friday's briefing that “decisions… haven’t been made yet.” 

From CNN's Michael Conte and Christian Sierra

The US Defense Department said it is “mindful and aware” of Ukraine’s request for multiple-launch rocket systems, but that “decisions … haven’t been made yet.”

“Our goal from the very beginning has been to try to help them in the fight that they’re in today,” said outgoing Pentagon press secretary John Kirby at a briefing with reporters.

“I won't go so far as to say it's too late to provide the Ukrainians with any system or capability that they might need because they are very active in the fight and they have pushed back the Russians up near Kharkiv,” Kirby said.

However, Kirby said the Defense Department is “mindful of the clock” when it comes to Russia’s invasion of Ukraine.

CNN reported Thursday that the Biden administration is preparing to send MLRS systems as part of a larger package of military and security assistance to Ukraine, which could be announced as soon as next week. The MLRS and its lighter-weight version, the HIMARS, can launch as far as 300 kilometers (186 miles), depending on the type of munition.

Ukrainian officials are denying that Severodonetsk in the Luhansk region is surrounded, but have acknowledged that Russian forces hold one part of the city.

"This is a war, a war against a very powerful enemy, and in theory anything is possible," Hayday said when asked about the possibility of Russian troops gaining further ground in the city. "The higher military command sees this situation. But so far I can't say that in a day, two, three they will completely take over the area. No, most likely they won't."

"We have enough strength," he continued, while also cautioning that, "Maybe there will be a command to our troops even to retreat."

From CNN's Anastasia Graham-Yooll in London

Ukrainian President Volodymyr Zelensky said nearly half of Ukraine’s grain export supply is currently held up as Russia continues to block the country’s main export routes through the Black Sea and Azov Sea, calling the situation a potential “catastrophe” for global food security.

Addressing an Indonesian foreign policy think tank in an online forum Friday, Zelensky said, “22 million tons of grain are kept in silos today. We cannot supply them to international markets where they are needed at this very point in time."

The Ukrainian president also said the UN estimates that famine might affect an additional 50 million people this year were a “conservative” estimate, implying that the number of those affected will be greater. 

The Ukrainian president also accepted an invitation to attend the G20 Summit in Indonesia in November. He urged the hosts to include “only friendly nations,” implying Russia should be excluded from the summit in Bali.

About 90% of residential buildings in Severodonetsk have been damaged amid a "fierce defense" of the eastern Ukrainian city, a local military official said Friday.

The city "held out through the night" under heavy Russian attack, Oleksandr Striuk, the head of the Severodonetsk military administration, said in a radio interview. But he acknowledged that Russian forces were continuing to press the offensive.

The city had seen widespread destruction, Striuk said. 

"The Azot (Nitrogen) chemical plant is being shelled," he said. "There are dead among the civilian population and among employees of the enterprise. Ninety percent of the housing stock is damaged, 60% will have to be rebuilt."

Striuk said a Russian force that entered a hotel on the north of the city was expelled by Ukrainian forces, a claim that could not be immediately verified. Ukrainian officials previously said the hotel was not under their control. 

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