Russia-Ukraine updates: Russian missiles hit close to nuclear reactors: IAEA director

Ukrainian President Volodymyr Zelenskyy lashed out against Russian forces in a recorded speech Monday hours after a missile struck a shopping mall in Kremenchuk, calling the attack "one of the most defiant terrorist attacks in European history."

"Only totally insane terrorists, who should have no place on earth, can strike missiles at such an object. And this is not an off-target missile strike, this is a calculated Russian strike -- exactly at this shopping mall," Zelenskyy said.

The Ukrainian president said the rescue and salvage efforts were still ongoing.

Ukraine's Emergency Service reported that 15 people were killed and 59 were injured in the attack as of Monday evening.

"We must be aware that the losses may be significant," Zelenskyy said.

-ABC News' Christine Theodorou

G-7 leaders released a statement condemning Russia’s missile strike on a shopping mall in Kremenchuk, Ukraine, saying it constitutes a war crime and that President Vladimir Putin “and those responsible will be held to account.”

“We stand united with Ukraine in mourning the innocent victims of this brutal attack," they said.

The summit began in Germany on Sunday with a heavy focus on the invasion of Ukraine, and the group announced more steps to try and stop Putin from funding his war.

“Today, we underlined our unwavering support for Ukraine in the face of the Russian aggression, an unjustified war of choice that has been raging for 124 days. We will continue to provide financial, humanitarian as well as military support for Ukraine, for as long as it takes. We will not rest until Russia ends its cruel and senseless war on Ukraine," G-7 leaders said.

-ABC News' Justin Gomez

At least 13 people were killed and more than 40 were hurt when a shopping mall was hit by missile strikes in the city of Kremenchuk in Ukraine's central Poltava region, according to the governor of the Poltava Oblast, Dmytro Lunin.

Over 1,000 civilians were there at the time, Ukrainian President Volodymyr Zelenskyy said.

Authorities have deployed forensic experts from Kyiv and war crimes investigators, National Police Chief Ihor Klymenko said.

Russians fired multiple rocket launchers on the city of Lysychansk in Ukraine's eastern Luhansk region, striking civilians who were collecting drinking water, according to Luhansk region governor Serhiy Haidai.

Eight have been killed and more than 20 are injured, Haidai said.