A Russian drone strike on Kharkiv, Ukraine's second-largest city, killed seven people overnight, including three children, according to Kharkiv regional governor Oleh Synyehubov on Saturday.

He added that at least 10 drones were launched at Kharkiv, with eight shot down, noting that civilian infrastructure in the Nemishlyan area of the city was shelled, causing a huge fire in 15 private homes.

Synyehubov said an oil depot was hit, among other things, causing fuel leakage that led to the fire. In a Facebook post, Serhiy Polvinov, head of the investigative department of the national police, quoted a local resident saying he saw "a real hell: first the fuel flowed, then everything caught fire."

Meanwhile, Interior Minister Ihor Klymenko said more than 50 people were evacuated and emergency workers managed to contain the fire by Saturday morning.

In an online statement, President Volodymyr Zelensky offered his condolences to the relatives of all the victims and said that “terrorism cannot go unpunished, and terrorism cannot go without a fair response. The terrorists must lose this war they started; Russia must be held accountable for every life it has destroyed.”

The Ukrainian Air Force said air defense systems destroyed 23 out of 31 Iranian-made Shahed drones launched by Russia overnight, and the statement added that the drones primarily targeted the Kharkiv region in the northeast and the southern Odessa region.

Odesa regional governor Oleh Kiper said four people were injured in drone attacks there overnight.

He added that the attacks came in three waves. The first targeted the regional capital – the coastal city of Odessa. All nine drones were shot down, but the debris damaged port infrastructure and injured one person.

Kiper said the second and third waves targeted port infrastructure in the Danube River region. Twelve drones were shot down and three people were injured.

The Romanian Ministry of National Defense said on Saturday that Russia carried out drone attacks overnight on the river ports of Izmail and Reni in Ukraine, near the border with Romania.

The ministry noted that an F-16 aircraft of the Turkish Air Force took off from a Romanian airbase at about 1:15 a.m. to carry out “reconnaissance missions” in the national airspace to monitor the situation. Text alerts were also issued to residents in two districts adjacent to the attacks.

Romania, a NATO member, has detected drone debris on its territory several times before, following continuous attacks on Ukraine’s port infrastructure, as Moscow tried to disrupt Kyiv’s ability to export grain and other products to global markets.

Meanwhile, the Russian Ministry of Defense accused Ukraine of targeting Russian civilian cargo ships in the Black Sea with naval drones on Friday evening. The ministry said one of these drones was destroyed, while other drones were jammed without damage to the ships.

The ministry did not specify the number of naval drones used or the number of ships targeted. No immediate comment was issued by officials in Kyiv on the alleged attack.