"As of now, the number of people killed as a result of a kamikaze drone attack on a residential building has increased to 3. 19 people have been rescued," Kyrylo Tymoshenko, deputy head of the president's office, said on Telegram.

Search and rescue operations are ongoing in the Ukrainian capital as emergency services work to retrieve people from underneath the rubble.

A six-month pregnant woman was one of the people killed in the drone strike, according to the city's mayor. 

"The bodies of three dead civilians were pulled out during search and rescue operations in a residential building in the city center, hit by a Russian drone. Among them is a young couple, a husband and wife, who were expecting a child. The woman was 6 months pregnant," Vitalii Klitschko said in a statement on Telegram.

Moscow launched drone attacks on residential buildings early Monday in Kyiv. Ukraine and US intelligence claimed that Russia used Iranian-supplied "kamikaze" drones to hit multiple regions in Ukraine, which Tehran has repeatedly denied.

Russia's defense ministry said on Monday that its forces launched massive high-precision strikes on military targets and energy infrastructure facilities across Ukraine.

October 17, 2022. Kyiv, Ukraine.
This is what is happening in the capital of one of the countries of Europe - terrorism and genocide. Ukraine needs more weapons and air defense NOW! pic.twitter.com/YOUMN5Y11J

— Iryna Voichuk???? (@irmachep) October 17, 2022

The European Union "will look for concrete evidence" on Iran’s involvement in Russia's military assault on Ukraine, according to the bloc's foreign policy chief.

Russia is "more and more isolated" and is "losing this war," Josep Borrell said as he arrived in Luxembourg for a meeting with EU foreign ministers on Monday.

When asked about Iran’s involvement in the war in Ukraine, Borrell said: "This is something that will be discussed … and we will look for concrete evidence about the participation (of Iran)."

EU foreign ministers are due to discuss "peace facility, military support" and a "training mission" to support Ukraine, Borrell added. 

These two photos perfectly illustrate why Ukraine urgently needs support with a modern air defense system. #Kyiv #IranianDrones #RussiaIsATerroristState pic.twitter.com/h1hxiV7ejN

— Anastasia Magazova (@a_magazova) October 17, 2022

Iran has repeatedly rebuffed claims from Kyiv and US intelligence that it is supplying "kamikaze" drones for Moscow's war on Ukraine.

The denials from Tehran follow a string of deadly drone attacks launched by Russia across Ukraine Monday.

CNN