By Pavel Polityuk and Olena Harmash

KYIV Russia said on Monday its military hit Ukrainian air bases in overnight strikes and Ukrainian forces shelled industrial facilities inside Russia as both sides sought the upper hand ahead of what Kyiv hopes will be a decisive counter-offensive.

In a rare acknowledgement of damage to a military "target", Ukraine said that work was under way to restore a runway and that five aircraft were taken out of service in the western region of Khmelnitskiy, although it did not name the site or sites.

A large military airfield was located in the region before the war.

"At the moment, work is continuing to contain fires in storage facilities for fuel and lubricants and munitions," the Khmelnitskiy regional governor's office said.

Russian state-owned news agency RIA cited the defence ministry as saying more than one air base had been hit, but there was no confirmation from Ukraine of damage to any other air bases.

The Ukrainian capital came under attack for the 16th time this month after a second successive night of bombardment. But officials said most of the drones and missiles fired overnight had been shot down and no targets were hit in the morning.

The attacks, which sent Kyiv residents running for shelter in metro stations, were part of a new wave of Russian air strikes this month as Ukraine, armed with new Western weapons, prepares a push to try to take back territory Russia has seized in the "special military operation" which it launched in February 2022.

"With these constant attacks, the enemy seeks to keep the civilian population in deep psychological tension," said Serhiy Popko, the head of the city's military administration.

Moscow said it invaded its neighbour to "denazify" the country and protect Russian speakers. Western opponents dismiss the invasion as an imperialist land grab in which tens of thousands have been killed, millions uprooted and whole cities reduced to ruins.

Russia has repeatedly said it is open to resuming peace talks with Kyiv, which stalled a few months after Russia invaded, and has welcomed mediation efforts from both Brazil and China.

A Ukrainian presidential aide said on Monday any post-war settlement should include a demilitarised zone of 100-120 km (62-75 miles) inside Russia along the border with Ukraine.

The zone would be necessary to protect Ukrainian regions from shelling, presidential adviser Mykhailo Podolyak wrote on Twitter.

CROSS-BORDER SHELLING

Ukraine's military said an attack on Odesa port had caused a fire and damaged infrastructure but did not specify whether the damage threatened grain exports.

The country is an important global grain supplier and the port is vital for shipping agricultural products abroad. It is also one of three included in a U.N.-brokered deal on the safe export of grain via the Black Sea.

Russia said on Monday that the Black Sea grain deal would no longer be operational unless a U.N. agreement with Moscow to overcome obstacles to Russian grain and fertiliser exports was fulfilled.

This month Moscow reluctantly agreed to extend the grain deal until July 17.

After months of attacks on energy facilities, Russia is now targeting military facilities and supplies to try to disrupt Ukraine's preparations for its counterattack, Kyiv says.

Moscow says Ukraine has stepped up drone and sabotage attacks against targets inside Russia as it prepares for the offensive.

The governor of Russia's Belgorod region, which borders Ukraine, said several frontier settlements were shelled simultaneously by Ukrainian forces on Monday. Two industrial facilities were hit in the town of Shebekino and four employees were wounded, Vyacheslav Gladkov wrote on Telegram.

There was no immediate comment from Ukraine and Reuters was not able to independently verify the reports on the scale of the attacks on either side.

Ukraine said it had shot down 29 of 35 drones and 37 of 40 cruise missiles fired overnight by Russia, and the Kyiv military administration said its air defences had shot down more than 40 of the "targets" fired at it.

"Another difficult night for the capital," mayor Vitali Klitschko said on Telegram.

The attack follows one the previous night - the largest drone barrage yet launched on Kyiv - in which one person was killed and several injured. In Sunday's attack, 36 drones were downed over the city.

(Additional reporting by Olena Harmash, Pavel Polityuk and Lidia Kelly; writing by Timothy Heritage, Philippa Fletcher and Nick Macfie; Editing by Hugh Lawson)