Ukrainian President Volodymyr Zelenskyy addressed the annual Hollywood fundraiser for actor Sean Penn's nonprofit Community Organized Relief Effort (CORE) Saturday night with a powerful video message urging people to continue to support Ukraine in its war against Russia.

"All of you have heard about the horrors that Ukraine is going through. Tens of thousands of explosions and shots, hundreds of thousands wounded and killed, millions who have lost their homes," Zelenskyy said in his virtual speech. "All of this is not a logline for a horror film. All of this is our reality."

Zelenskyy's video message included footage showing missiles striking homes and apartment complexes in Ukraine, civilians dead in the streets of Ukrainian cities and children playing in parks amid the backdrop of bombed buildings.

Among those attending the CORE fundraiser, held at the Hollywood Palladium in Los Angles, were Penn and CORE co-founder Ann Lee, former President Bill Clinton, Los Angeles Mayor Eric Garcetti, singer John Legend, and actors Patrick Stewart and Sharon Stone.

The group said the event raised more than $2.5 million for CORE's disaster relief and preparedness work, including its urgent humanitarian response in Ukraine.

Zelenskyy noted that Penn traveled to Ukraine at the start of the Russian invasion and witnessed the atrocities firsthand. He thanked Penn and his group for the continued support for Ukraine.

"We have been resisting it for 107 days in a row," Zelenskyy said of Russia's aggression in Ukraine. "We can stop it together. Support Ukraine, because Ukraine is fighting for the whole world, for democracy, for freedom, for life."

Ukraine's Armed Forces Commander-in-Chief Valeriy Zaluzhny said Sunday that he told his American counterpart, Gen. Mark Milley, U.S. Chairman of the Joint Chiefs of Staff, that Russian firepower superiority in the Luhansk region is far greater than that of Ukrainian forces.

Zaluzhny said that during a briefing he told Milley that Russian forces are concentrating their efforts in the north of the Luhansk region, where they are using artillery "en masse" and their firepower superiority is 10 times that of Ukraine's.

"Despite everything, we keep holding our positions," Zaluzhny said.

Zaluzhny also said Russia has deployed up to seven battalion tactical groups in Severdonetsk, a city in the Luhansk region. He said Russian shelling of residential areas in Kharkiv in northeast Ukraine has resumed.

Russian forces destroyed a second bridge leading into Severodonetsk and are now targeting a third bridge in an effort to completely cut off the city, Luhansk region Gov. Sergiy Haidai said Sunday. Ukraine's army still controls around one third of the city, he said.

Haidai said that Ukrainian forces are still holding onto the Azot chemical plant in Severodonetsk, where around 500 civilians are taking shelter.

If Severodonetsk falls, Lysychansk will be the only city in the Luhansk region that remains under Ukraine's control.

Zaluzhny said that as of Sunday, the front line of the war stretched 1,522 miles and that active combat was taking place on at least 686 miles of the front line.

Zaluzhny said that during his briefing with Milley, he reiterated Ukraine's urgent request for more 155 mm caliber artillery systems.

Russia claims a cruise missile strike destroyed a large warehouse in western Ukraine storing weapons supplied to the Ukrainians by the United States and European allies.

While police in the Ternopil region of Ukraine, where at least one cruise missile hit, told ABC News that no weapons were destroyed, the region’s governor said part of a military facility was damaged.

Ternopil's governor Volodymyr Trush posted a video showing widespread damage from what he said were four Russian missiles launched Saturday from the Black Sea. Trush said 22 people were wounded, including a 12-year-old child, in the missile strikes.

In addition to the military facility, Trush said four five-story residential apartment buildings were damaged. One of the missiles hit a gas pipeline, he said.

Russia’s defense ministry said Kalibr high presicion sea-based, long-range missiles struck near Chortkiv in the Ternopil province and destroyed a large warehouse full of anti-tank missile systems, portable anti-aircraft missile systems and artillery shells supplied by the United States and European countries.

A new era for Russia's fast-food and economic scene dawned on Sunday as McDonald's restaurants flung open their doors in Moscow under new Russian ownership and with the new name "Vkusno & tochka," which translates as "Tasty and that's it.”

Alexander Govor, the new owner of the chain, attended a ribbon cutting ceremony at what was once McDonald's flagship restaurant in central Moscow, before the first customers were granted entry, met with cheering and applause from restaurant staff.

Scores of people lined outside the flagship Moscow restaurant, which is among 15 rebranded outlets that will initially open in and around the capital on Sunday.

The queue was significantly smaller than the thousands of people who thronged to the original McDonald's opening there in 1990 during the Soviet era.

Oleg Paroev, chief executive of Vkusno & tochka, said the company was planning to reopen 200 restaurants in Russia by the end of June and all 850 by the end of the summer.

The chain will keep its old McDonald's interior but will expunge any references to its former name, said Paroev, who was appointed Russia McDonald's CEO weeks before Moscow sent tens of thousands of troops into Ukraine on Feb. 24.

McDonald's closed its restaurants in Russia on March 14 and said in mid-May it decided to leave the market.

-ABC News’ Rashid Haddou

Jalina Porter, the State Department's deputy spokesperson, is responding to the Russian attack at a Ukraine train station that killed at least 50, saying, "We can no longer be surprised by the Kremlin's repugnant disregard for human life."

Five children were among those killed when Russian rockets struck the station in Kramatorsk in Donetsk Oblast on Friday morning, according to Ukraine's state-owned railway company. At least 100 people were injured, according to Donetsk Oblast Gov. Pavlo Kyrylenko.

Russia has denied involvement in the attack, which occurred as "thousands" of civilians fleeing the Russian invasion were at the train station waiting to be taken to "safer regions of Ukraine," according to Kyrylenko.

"Civilians are killed when they stay in their homes, and they're killed when they try to leave," Porter said. "Actions like these demonstrate why Russia did not belong on the U.N. Human Rights Council, and they also reinforce the U.S. assessment that members of Russian forces are committing war crimes in Ukraine."

Porter declined to say if the department considers the train station attack a war crime, saying, "Assessing individual criminal liability in specific cases is the responsibility of courts, as well as other investigatory bodies. But as the secretary, Secretary [of State Antony] Blinken, has said, 'Those responsible for war crimes and other atrocities committed in Ukraine will be held to account.'"

-ABC News' Conor Finnegan