Ukrainian Air Force reports ‘ballistics on Kyiv’ amid reports of strikes in Chernihiv

The Ukrainian Air Force has reported “ballistics on Kyiv,” as air defense measures were activated in the capital city.

Kyiv’s mayor said Russian drones are “entering the city” in a post on Telegram. He urged people to “stay in shelters” and said medics were “heading to the scene” in the post.

This comes amid preliminary reports that a “high-rise building was hit” in Chernihiv, a city northeast of Kyiv, the head of the Chernihiv City Military Administration Dmitry Bryzhynskyi wrote in a post on Telegram.

“The city is currently under attack,” Bryzhynskyi wrote in the post, originally written in Ukrainian.

MORE: Aftermath of Ukraine drone strike on Russian airfields shown in satellite imagery

The escalation of attacks between Ukraine and Russia comes as U.S.-brokered peace talks between the countries have failed to come to fruition. High-level delegations from both Ukraine and Russia met in Istanbul, Turkey, on Monday for a second round of talks, but the proposed memorandums presented by each delegation have not moved forward in any meaningful way.

In a phone call between Russian President Vladimir Putin and President Donald Trump on Wednesday, the memorandums for a potential peace deal presented Monday were not discussed, Putin’s aide Yuri Ushakov told reporters.

A U.S. official also said this week that there was evidence that Russia was preparing to retaliate against Ukraine for the drone strikes that targeted Russian military sites on Sunday.

MORE: As Ukraine and Russia step up attacks, the Trump administration takes a step back: Analysis

At least 11 Russian bomber aircraft and one large transport plane were badly damaged or destroyed in Ukraine’s drone attack against Russia, according to satellite imagery reviewed by experts and ABC News.

The covert operation was described as one for the “history books” by Ukraine’s President Volodymyr Zelenskyy.

This is a developing story. Please check back for updates.