Russian President Vladimir Putin speaks during a meeting. File photo
Putin told a news conference on Monday that Ukrainian drones had used the same marine corridors that grain ships transited under the UN-brokered deal.
Kyiv has not claimed responsibility for the attack and denies using the grain programme's security corridor for military purposes. The United Nations said no grain ships were using the Black Sea route on Saturday when Russia said its vessels in Crimea were attacked.
Meanwhile, on the 250th day of a war that has ground on since Russia's invasion of Ukraine on Feb. 24, Russian missiles rained down across the country. Explosions boomed out in Kyiv, sending black smoke into the sky.
Russian forces shelled infrastructure in at least six Ukrainian regions on Monday, the General Staff of the Ukrainian Armed Forces said in a statement on Facebook.
Thick black smoke rises from a fire on the Kerch bridge that links Crimea to Russia. File/AFP
"That's not all we could have done," Putin said at the televised news conference, indicating more action could follow.
Ukrainian officials said energy infrastructure, including hydro-electric dams, was hit, knocking out power, heat and water supplies.
Oleh Synehubov, the governor of the northeastern Kharkiv region, said on Telegram that about 140,000 residents were without power after the attacks, including about 50,000 residents of Kharkiv city, the second largest city in Ukraine.
Ukraine's military said it had shot down 44 of 50 Russian missiles. But strikes left 80% of Kyiv without running water, authorities said. Ukrainian police said 13 people were injured in the latest attacks.
For the past three weeks, Russia has attacked Ukrainian civil infrastructure using expensive long-range missiles and cheap Iranian-made "suicide drones" that fly at a target and detonate.
Ukraine's Prime Minister Denys Shmyhal said 18 targets, mostly energy infrastructure, were hit in missile and drone strikes on 10 Ukrainian regions on Monday.
UN spokesman said the Russian leader and UN chief discussed "proposals for humanitarian assistance and evacuation of civilians from conflict zones, namely in relation to the situation in Mariupol.”
"Now, of course, those who live in Kherson should be removed from the zone of the most dangerous actions, because the civilian population should not suffer," Putin told pro-Kremlin activists as he marked Russia's Day of National Unity.
Putin’s address to the nation comes a day after Russian-controlled regions in eastern and southern Ukraine announced plans to hold votes on becoming integral parts of Russia.
The United States vetoed a UN Security Council resolution on Tuesday that called for an immediate ceasefire in Gaza, drawing stern criticism from allies as President Joe Biden faces mounting pressure to temper support for Israel.
Two friends in western France have built a 16-metre high replica of the Eiffel Tower from recycled wood, which they hope to display along the path of the Summer 2024 Olympic torch relay and on Olympic sites.
The vote in the 15-member Security Council was 13-1 with the United Kingdom abstaining. The United States circulated a rival UNSC resolution that would support a temporary cease-fire in Gaza linked to the release of all hostages, and call for the lifting of all restrictions on the delivery of humanitarian aid.