Six people were killed in Ukraine following overnight Russian attacks on the Black Sea port of Odessa and the eastern city of Sumy, according to local officials.

The governor of the Odessa region, Oleh Kiper, said the “massive” drone and missile attack marked the fifth day Russia has attacked the region.

Across the country, three people were killed and 17 wounded in a “guided aerial bomb” attack on Sumy, the city’s acting mayor, Artom Kobzar, said.

Meanwhile, Ukraine’s military said its drones attacked 20 Russian ships, including 17 oil tankers, in the Black Sea overnight.

The Russian Defense Ministry confirmed that it had attacked Odsea, stating that it had deliberately attacked port infrastructure, “used for the unloading of petroleum, oils and lubricants.”

Writing on Telegram, Kiper accused Russia of deliberately targeting civilians and said residents were killed and injured when a Russian missile hit a multi-story residential building.

He added that a non-residential building and a gas pipeline were also affected.

In its statement, Russia claimed to have attacked sites involved in the manufacturing of military equipment and cargo transportation.

Russia’s attacks in recent days have targeted Ukrainian deepwater Black Sea ports in the broader Odessa area, which handle much of the country’s grain and other cargo and are vital to its wartime economy.

It comes after intense attacks on Russian ships in the Sea of ​​Azov, which lies between Crimea, the eastern coast of Ukraine, and Russia.

The Ukrainian attacks have forced Russia, the world’s top grain exporter, to restrict shipping in the Sea of ​​Azov, a route through which about a quarter of its grain exports pass, according to the Reuters news agency.

As attacks continue, Ukraine is trying to navigate a tumultuous political situation that has seen President Volodymyr Zelensky oust Prime Minister Yulia Svyrydenko after less than a year in office.

A motion to accept Svyrydenko’s resignation was passed in the Ukrainian parliament on Tuesday, even though some lawmakers questioned whether the reason for the change had been explained.

Serhiy Koretskyi, head of state oil and gas company Naftogaz, is seen as a likely successor to Svyrydenko, and parliament will vote on the appointment on Thursday.

On Wednesday morning, European Commission President Ursula von der Leyen arrived in kyiv to discuss cooperation between the European and Ukrainian defense industries.