On Sunday a Russian warship fired warning shots at a cargo ship in the south-western Black Sea as it made its way north, the first time Russia has fired on a merchant ship since exiting the UN-backed grain deal last month.

In July, Russia halted participation in the Black Sea grain deal that allowed Ukraine to export agricultural produce via the Black Sea. Since then, Moscow has said that it deems all ships heading to Ukrainian waters to be potentially carrying weapons.

On Sunday, Russia said in a statement that its Vasily Bykov patrol ship had fired automatic weapons on the Palau-flagged Sukru Okan vessel after the ship’s captain failed to respond to a request to halt for an inspection.

Russia said the vessel was making its way toward the Ukrainian port of Izmail.

The Russian military boarded the vessel with the help of a Ka-29 helicopter, the ministry said.

“After the inspection group completed its work on board, the Sukru Okan continued on its way to the port of Izmail,” the defence ministry said.

A senior adviser to Ukrainian president Volodymyr Zelenskiy said the incident was a “clear violation of international law of the sea, an act of piracy and a crime against civilian vessels of a third country in the waters of other states.”

Ukrainian forces are trying to pierce Russian lines in the western parts of Donetsk region, a Russian-installed official has said.

Vladimir Rogov, a Russian-installed official in parts of Zaporizhzhia controlled by Moscow, said that there had been intense fighting south of Velyka Novosilka as Ukrainian troops try to get through Russian lines to push down to the coast on the Sea of Azov as part of Kyiv’s counteroffensive.

“The enemy managed to enter and gain a foothold in the northern part of Urozhaine after two weeks of the heaviest and bloodiest battles for this settlement,” Rogov said, referring to the same part of the frontline.

He said Russian soldiers still controlled the southern part of Urozhaine, adding that Ukrainian forces were clearly aiming to take control of a town further south, Staromlynivka.

Ukraine launched its counteroffensive in June, attempting to retake swathes of territory captured by Russia in the south and east of the country. It has recaptured several villages in the south and some territory around the ruined city of Bakhmut in the east but has so far not achieved major gains against well-dug-in Russian troops.

Odesa was hit by two waves of attacks overnight: a total of 15 drones, and 8 Kalibr missiles, according to the governor of the local region.

Oleg Kiper says that Ukrainian air defences “destroyed everything.”

As a result of the downing of the rockets that the Russians aimed at the centre of Odesa, debris damaged a dormitory of one of the educational institutions, a residential building and a supermarket.
The blast wave knocked out windows in several buildings and damaged cars parked nearby. Fires broke out at three facilities.”

Three employees of the supermarket were injured, two of whom have been hospitalised.

Ukraine’s southern military district command has released these images from Odesa, showing the aftermath of the drone and missile attacks on the port city.

The photos, shared on Telegram, show firefighters trying to extinguish flames engulfing a multi-storey supermarket, with a large plume of smoke rising into the air.

Ukrainian president, Volodymyr Zelenskiy promised justice after Russian shelling killed seven people – including a 22-day-old infant – and wounded at least 22 others Kherson on Sunday.

Local officials in the southern region, which Kyiv liberated part of last year, have declared a day of mourning for Monday.

Five people were killed in the shelling on the village of Shyroka Balka, including a family of four. Two other people, including the pastor of a church, were killed in the neighbouring village of Stanislav.

Later in the evening on Sunday, the local Kherson government said a new airstrike and artillery shelling had injured a 31-year-old woman and a man and damaged at least 12 houses in the town of Bilozerka. It also said three guided aerial bombs had damaged several houses in the village of Odradokamianka.

In his nightly address, Zelenskiy said that by 6 pm there had been 17 reports of shelling in Kherson region alone on Sunday, as well as incidents in the regions of Mykolaiv, Zaporizhzhia, Donbas, Kharkiv, and in border areas in northeast Ukraine.

“There is no day when Russian evil does not receive our entirely just response,” he said, adding that he would “not leave any of Russia’s crimes unanswered.”

Ukraine’s city of Odesa has endured another night of Russian drone and missile attacks, the latest of which have left at least three people injured, according to local officials.

The governor of the region on the Black Sea said falling rocket fragment had resulted in fires breaking out.

“Windows in buildings were blown out by the blast wave,” Oleh Kiper wrote on the Telegram messaging app.

Ukraine’s armed forces command in the south said that its air defence forces destroyed all 15 drones and eight Kalibr-type sea-based missiles that Russia launched at the port.

The nearby port city of Mykolaiv was also targeted, with air alarms sounding throughout the night.

Odesa, Ukraine’s largest port and naval base, has been repeatedly attacked with missiles and drones since Moscow last month pulled out of a UN backed agreement that allowed grain to be safely shipped from Ukraine’s ports.

Welcome back to the Guardian’s live coverage of the war in Ukraine. This is Jonathan Yerushalmy with the latest.

Our top story this morning:

Russian strikes on the southern port city of Odesa overnight left at least three people injured, according to the region’s governor.

“As a result of the enemy attack in Odesa, several fires broke out from falling rocket fragments,” Oleh Kiper wrote on the Telegram messaging app.

The attack comes after a deadly weekend of Russian strikes in Ukraine, with seven people – including a young baby – killed in Kherson. More on that shortly.

In the meantime, here’s a summary of the other main news over the last 24 hours:

• A Russian warship fired warning shots at a cargo ship in the south-western Black Sea, the first time Russia has fired on a merchant ship since exiting a UN-brokered grain deal last month. Russia said in a statement that its Vasily Bykov patrol ship fired automatic weapons on the Palau-flagged Sukru Okan vessel after the ship’s captain failed to respond to a request to halt for inspection.

• Three civilians were injured in the Kursk region from shells coming over the Ukrainian border, the regional governor said. Roman Starovoit said Ukraine was behind the shelling, Ukraine did not claim responsibility and it was unclear where the shelling originated.

• Ukrainian forces were trying to pierce Russian lines in the western parts of Donetsk region, a Russian-installed official said. Vladimir Rogov said there had been intense fighting south of Velyka Novosilka as Ukrainian troops tried to push down to the coast on the Sea of Azov. “The enemy managed to enter and gain a foothold in the northern part of Urozhaine after two weeks of the heaviest and bloodiest battles for this settlement,” Rogov said.

• The governor of the Russian region of Belgorod blamed a Ukrainian drone for damage to an apartment building on Sunday, after Russia’s defence ministry said air defences shot down at least four Ukrainian drones close to the border. Russia’s defence ministry said air defences shot down another drone later on Sunday and there were no casualties.

• Germany will deliver a Luna New Generation drone system to Ukraine, Bild am Sonntag has reported. The equipment will include a ground control station with several drones, a launch catapult and military trucks.

• Authorities briefly halted traffic on the Russian-built Kerch Bridge connecting occupied Crimea with Russia – but did not provide a reason why. It came one day after Russian air defence reportedly thwarted three Ukrainian missile attacks.

• Ukraine has become the most heavily mined country on Earth after a year and a half of Russian troops laying them down. Soldiers have been unearthing five mines for every square metre in some places, Oleksii Reznikov, Ukraine’s defence minister, told the Guardian.