At least four people were killed and six injured overnight in southern and eastern Ukraine after a major Russian airborne assault involving scores of drones launched from multiple directions.

Early indications suggest a Russian anti-aircraft system may have downed the passenger jet that crashed in Kazakhstan, a US official told CNN, as authorities recovered a second black box that they hope will shed light on the cause of the disaster that killed dozens of people.

Russia launched more than 40 attack drones across the Azov Sea into eastern and central Ukraine overnight, damaging houses in Kharkiv and Odessa, the Ukrainian military said.

Russia launched new strikes on Ukraine's territory during the afternoon of Friday, January 3, using missiles and drones, according to the Ukrainian Air Force. The attacks occurred between 12:00 p.m. and 8:00 p.

Russian forces launched 81 drones at Ukraine overnight from the Russian cities of Bryansk, Kursk, Orel, and Primosk-Akhtarsk, Ukraine's Air Force said.

Ukraine plans to significantly boost its production capacity for drones and missiles. Prime Minister Denys Shmyhal announced that in 2025, the country aims to produce 30,000 long-range drones and 3,000 cruise missiles and missile drones.