Russia-Ukraine updates: Putin suspends key US-Russia nuclear treaty in speech denouncing West

Ukrainian President Volodymyr Zelenskyy on Tuesday demanded that Russia end its invasion and reiterated that the territorial integrity of his country is not up for negotiation.

Appearing via video link from Kyiv, Zelenskyy addressed the leaders of the Group of 20 at a summit in Bali as the "dear G-19" -- an apparent snub to Russia, whose foreign minister was attending the event.

"Apparently, one cannot trust Russia's words and there will be no Minsk 3, which Russia would violate immediately after signing," Zelenskyy said, referring to the Minsk 1 and 2 agreements signed in 2014 and 2015, respectively, which aimed to bring an end to fighting at that time. Russia invaded and annexed the Crimean Peninsula in 2014 before using Kremlin-backed proxies to seize territory in the Donbas region of eastern Ukraine.

"I want this aggressive Russian war to end justly and on the basis of the U.N. charter and international law," he added. "Ukraine should not be offered to conclude compromises with its conscience, sovereignty, territory and independence. We respect the rules and we are people of our word."

The Ukrainian president called on the United Nations to dispatch a mission to assess the damages to his country’s energy infrastructure from Russian missile strikes. He said Russian forces should also withdraw from the Zaporizhzhia nuclear power plant -- the largest in Ukraine and in Europe -- so that the International Atomic Energy Agency -- the U.N.'s nuclear watchdog -- can take control of the site together with Ukrainian officials.

In addition, Zelenskyy said his country needs a framework that guarantees the long-term security of his country and he called again for a special tribunal to investigate Russian war crimes in Ukraine. He called this series of proposals Ukraine's "peace formula" and all of them, he said, must be achieved before there is an end to the ongoing war.

"If Russia wants to end this war, let it show it with actions," Zelenskyy said. "We will not allow Russia to wait us out, to grow its forces and then start a new series of terror and global destabilization. I am sure that it is necessary and possible to stop this destructive Russian war now."

In response, Russian Foreign Minister Sergey Lavrov, who was attending the G-20 summit in Bali, called Zelensky's demands "unrealistic."

-ABC News' Tom Soufi Burridge and Patrick Reevell

There are reports of Russian strikes in several regions throughout Ukraine after Ukrainian President Volodymyr Zelenskyy spoke to G-20 leaders.

The head of the regional administration in Kharkiv confirmed strikes in that region. Ukrainian media reported that people in the Zhytomyr region are without power after strikes.

There are also unconfirmed reports of explosions in the Lviv region, Rivne and Kryvyi Rih.

-ABC News' Tom Burridge

There have been a series of Russian missile strikes on Kyiv, with the city's mayor, Vitaliy Klitchko, saying two residential buildings have been hit and several missiles were shot down by air defense.

Unverified videos circulating show an apartment block engulfed in flames.

Klitchko said at least one person was killed during the afternoon strikes on the city's center. A body has been recovered from one of the residential buildings that was hit.

Russia launched 100 missiles on Ukraine Tuesday, the highest number of missiles launched in a single day since the beginning of the war, according to Yuri Ignat, Ukraine's Air Force spokesman.

Previously, the highest number of missiles was 84 missiles launched on Oct. 10.

Nearly 50% of Kyiv remains without power tonight, according to Vitaliy Klychko, the city's mayor.

-ABC News' Tom Soufi Burridge and Will Gretsky

The International Atomic Energy Agency will send security missions to three nuclear plants in Ukraine, the agency announced Monday.

Safety and security experts will be dispatched to the South Ukraine, Khmelnytskyi and Rivne Nuclear power plants following a request from Ukraine, the IAEA said in a statement. A security mission will also be conducted at the Chernobyl site, said IAEA Director General Rafael Mariano Grossi.

The IAEA already has a team of experts continuously present at the country’s largest such facility, the Zaporizhzhya plant, and has been carrying out safety measures and checks at three other locations in Ukraine at the request of the Ukrainian government following allegations by the Russian Federation about activities there, according to the agency.

"From the beginning of the war in Ukraine, the IAEA has been doing everything it can to prevent a nuclear accident with potentially serious consequences for public health and the environment," Grossi said. "We have delivered nuclear safety and security equipment, produced impartial assessments of the situation, and provided technical expertise and advice."

-ABC News' Will Gretzky