At least four people were killed and 17 others injured in Ukraine’s northeastern city of Kharkiv after what local officials described as a “massive” Russian drone attack late Sunday, intensifying fears of renewed aerial bombardments as winter sets in.

“Every night and every day bring new challenges for our city — new destruction and new work,” Kharkiv Mayor Ihor Terekhov wrote on Telegram, confirming the casualties and widespread damage across residential areas.

Kharkiv was among several regions struck during Russia’s latest overnight barrage, in which Ukraine’s air force said Moscow launched 162 drones. Ukrainian defenses intercepted or suppressed 125 of them, but 37 drones still hit targets across 15 locations.

“The most damage was suffered by civilian infrastructure and private households in the Kharkiv, Chernihiv, and Dnipropetrovsk regions,” the air force said. “Unfortunately, there are civilian casualties.”

Russia’s Defense Ministry also reported incoming attacks, claiming its forces shot down at least 103 Ukrainian drones overnight and into Monday afternoon. Among them, four were intercepted over the Moscow region — two of which were headed toward the capital.

The latest exchange of strikes unfolded as U.S., European, and Ukrainian officials met in Geneva to discuss the controversial 28-point American peace proposal submitted to Kyiv last week. Critics say elements of the draft would amount to a forced concession to Moscow.

U.S. Secretary of State Marco Rubio told reporters the talks were “probably the most productive and meaningful meeting we’ve had so far in this entire process since we became involved.”

Rubio said the presidents of both nations would need to sign off on any final framework but added he was “comfortable” with the progress.

“We’re making some changes and adjustments in hopes of further narrowing the differences and getting closer to an outcome that both Ukraine and the United States can be comfortable with,” he said.