Ukraine invasion: Three children among nine dead as footage shows Kharkiv apartment block being rocked by series of blasts

Three children are among nine people who were killed when Russian forces shelled parts of Ukraine's second largest city - with footage showing a series of explosions outside an apartment building.

A harrowing sound can be heard as the explosives lash the ground in quick succession outside the building in southeastern Kharkiv.

One of the explosives hits a car and causes it to catch fire.

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It is not clear what type of attack is taking place, but it comes as suspected cluster munitions have struck several buildings in Kharkiv.

Ihor Terekhov, the mayor of the city, said nine people had died and 37 were injured as a result of shelling there.

Cluster munition?

Sky News has pinpointed two separate videos to northeastern Kharkiv and a military expert said the shelling appears to be the classic pattern for a cluster munition.

Cluster munitions are a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller submunitions - with the explosive bomblets designed to kill personnel and destroy vehicles.

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A clip posted to social media shows multiple explosions striking a building in quick succession.

Footage captures the harrowing sound of the shelling as smoke fills the surrounding area.

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Another video shows a similar series of quick explosions on another building from a distance below a cloud of thick white smoke - with a woman heard sobbing in the background.

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It comes as the interior ministry in Ukraine said on Monday that dozens have been killed in mass rocket strikes by Russian forces in Kharkiv.

"Kharkiv has just been massively fired upon by grads (rockets). Dozens of dead and hundreds of wounded," Ukrainian interior ministry adviser Anton Herashchenko said in a post on Facebook.

The first round of peace talks between Russian and Ukraine ended without an immediate agreement on Monday, as satellite images showed a more than three-mile-long Russian military convoy nearing Kyiv.

Kyiv was hit by more large explosions on Monday as the first round of talks with Russia over ending its invasion concluded.

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Russian troops are attacking on multiple fronts and are believed to be around 25km (15 miles) from the capital.

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Satellite images from the Maxar company captured signs of fighting outside Kyiv, including destroyed vehicles and a damaged bridge.