KYIV, Ukraine — Russia unleashed a missile and drone barrage Sunday across parts of Ukraine that killed six people, Kyiv officials said, as Moscow followed through on its promise to retaliate for an attack on a Russian tanker.

Separately, Moscow’s second-largest airport briefly suspended flights early Sunday following a foiled drone attack near the Russian capital.

Ukraine’s air force said Russia launched 70 drones and missiles from aircraft over the Caspian Sea, including Iranian-made, Shahed-136/131 strike UAVs.

Three waves of missiles hit the Starokostiantyniv area, damaging several buildings and igniting a fire at a warehouse, said Serhiy Tyurin, deputy head of Ukraine’s Khmelnytsky region military administration. The strike may have been intended for the city’s airfield, officials said.

Ukrainian President Volodymyr Zelenskyy said the facilities of aircraft engine manufacturer Motor Sich in the Zaporizhzhia region had also come under attack.

The Russian barrage followed a Ukrainian drone attack on a Russian tanker in the Black Sea near Crimea late Friday. Ukraine also struck a major Russian port with drones earlier the same day.

Russian Foreign Ministry spokeswoman Maria Zakharova condemned what she called a Ukrainian “terrorist attack” on a civilian vessel in the Kerch Strait.

“There can be no justification for such barbaric actions, they will not go unanswered and their authors and perpetrators will inevitably be punished,” she posted on the Telegram messaging app.

An official with Ukraine’s Security Service confirmed to The Associated Press that a Ukrainian drone packed with 450 kilograms (992 pounds) of explosives struck the tanker that was transporting fuel for Russian forces. The official spoke on condition of anonymity because he was not authorized to speak publicly.

Russia’s Federal Agency for Marine and River Transport posted on Telegram that although the drone blasted a hole in the tanker’s engine room, there were no casualties among the 11 crew members. On Sunday, a Ukrainian missile hit the Chonhar bridge connecting the Russian-occupied Kherson region and northern Crimea, causing minor damage to the span’s roadway, said Vladimir Saldo, the Moscow-installed leader of the Kherson region. He also said several more rockets had been shot down by air defense forces.

The bridge, which is one of three key spans connecting the Crimean Peninsula to the mainland, was previously attacked on July 22 and July 29.