One person is dead and 33 others were injured after a missile strike hit the Ukrainian city of Zaporizhzhia, according to the head of Zaporizhzhia's regional military administration Yurii Malashko.

Among the victims are two children, who are 7 and 9 years old. Eleven adults were hospitalized, with four in serious condition, according to the secretary of the city council, Anatoly Kurtev.

-ABC News' Will Gretsky

Chinese President Xi Jinping hadn't even left Moscow when the drones started exploding. It came a matter of hours after Xi and Russian President Vladimir Putin proclaimed they were the ones who wanted to make "peace" in Ukraine.

Ukrainian officials say 21 lethal attack drones were launched overnight and into this morning by Russia, with 16 shot down by the Ukrainians.

An apartment block was hit in a town southeast of Kyiv, killing at least four people and injuring others, officials said. Russian officials claim Ukrainian soldiers were based there. The Ukrainians are calling it a "civilian" building.

Russian missiles later hit an apartment block in the heart of the southern Ukrainian city of Zaporizhzhia.

And in an apparent repost to the geopolitical theatrics in Moscow, Ukrainian President Volodymyr Zelenskyy visited his troops on Wednesday in the eastern Donbas, not far from the embattled city of Bakhmut, according to his officials.

Bakhmut has become a potent symbol of Ukrainian resistance and sacrifice and despite being surrounded on three sides Ukrainian forces inside the city are, after months of fighting there, still holding on.

Zelenskyy's office released video of him addressing troops and also visiting injured soldiers in a military medical facility in the region. He told troops their "destiny was difficult but important" because they were fighting to save the motherland.

-ABC News' Tom Soufi-Burridge and Yulia Drozd

A Russian missile struck an apartment building in Zaporizhzhia, Ukraine, on Wednesday, injuring at least 18 people, officials said.

"This must not become 'just another day' in" Ukraine, President Volodymyr Zelenskyy said on Twitter.

"The world needs greater unity and determination to defeat Russian terror faster and protect lives," he said.

The victims included two children, secretary of the City Council Anatoly Kurtev said. Eleven adults were hospitalized, with four in serious condition, he said.

-ABC News' Joe Simonetti

Explosions were heard and felt in the cities of Odesa and Kherson and the regions of Zaporizhzhia and Donetsk on Tuesday evening, officials and people on the ground in Ukraine reported on social media channels.

During the attack on Odesa, Ukraine's air defense shot down two X-59 guided missiles launched by Russian fighter jets, the Ukrainian Air Force said on its Telegram channel.

Russia fired four missiles at Odesa, Andriy Yermak, the head of the presidential office, said on his Telegram channel. Two rockets were shot down by Ukrainian air defense, and two rockets hit the city, he said.

Three people were wounded, and a three-story building on the complex of a monastery was damaged, Yermak said.

Three people were killed, and four were wounded as a result of Russian shelling in the Donetsk region, the Ukrainian Office of the Prosecutor General reported on Facebook.

-ABC News' Ellie Kaufman

The Russian oligarch behind the Wagner private paramilitary group fighting for the Kremlin in Ukraine is threatening a mutiny if his forces are not resupplied with ammunition soon.

Yevgeny Prigozhin, owner and curator of the Wagner group, penned a letter to Russian Defense Minister Sergei Shoigue, demanding ammunition be provided to his forces on the battlefield.

In the letter, Prigozhin wrote that if supply problems are not fixed fast, he will complain to Russian President Vladimir Putin and his mercenaries would abandon their positions in Bakhmut, Ukraine, where heavy fighting has been going on for weeks, The Moscow Times reported.

“I appeal to Shoigu with a request to immediately issue ammunition. In case of refusal, I consider it necessary to convey to the Supreme Commander-in-Chief information about the existing problem in order to make a decision and about the advisability of further presence of Wagner PMC in Bakhmut in the conditions of a shortage of ammunition," Prigozhin wrote.

He added, "If the deficit is not replenished ... we will be forced to withdraw part of the units from this territory, and then everything else will crumble. Therefore, the bell is already ringing -- it is called an alarm."

Emphasizing the urgency, Prigozhin noted that Ukraine is planning to launch a counteroffensive soon.

There was no immediate public response from Shoigu or the Kremlin.

"We need to stop deceiving the population and telling that everything is fine with us," Prigozhin wrote. "I must honestly say: Russia is on the brink of disaster. If these screws are not adjusted today, the 'aircraft' will crumble in the air."