25 August 2014 Last updated at 05:27 ET

Ukraine crisis: Russia 'to send new aid convoy'

First Russian aid convoy returns, 23 Aug

The first Russian aid convoy returned at the weekend

Ukraine crisis

Russia plans to send another humanitarian convoy into eastern Ukraine "in the next few days", Foreign Minister Sergei Lavrov has said.

Mr Lavrov said the humanitarian situation there was "deteriorating".

Ukraine did not authorise the first convoy, which returned to Russia at the weekend, fearing it carried military equipment for pro-Russia separatists.

Ukrainian officials said a convoy of armoured vehicles crossed from Russia on Monday, sparking heavy clashes.

The crossing was reported close to the south-eastern Ukrainian city of Mariupol.

"The Ukrainian border has been breached by a convoy of several dozen tanks and armoured vehicles," security spokesman Leonid Matyukhin told Agence France-Presse.

"The convoy has been stopped by border guards... The battle is ongoing."

More than 2,000 people have died in recent months in fighting between Ukrainian government forces and the separatists. Some 330,00 people have been displaced.

The Russian and Ukrainian presidents are scheduled to meet in Minsk, Belarus, on Tuesday for talks on the crisis.

'Armoured column'

Mr Lavrov said he had sent a note to the Ukrainian foreign ministry on Sunday informing it of the new convoy.

He told a news conference on Monday: "The humanitarian situation is not improving but deteriorating.

Mr Lavrov denied reports of any Russian incursion

Ukrainian forces check burnt vehicles after rebel shelling

A pro-Russian rebel displays a flag in central Donetsk

"We want to reach an agreement on all conditions for delivering a second convoy by the same route... in the coming days."

Ukrainian sources said a column of about 30 armoured vehicles had entered from Russia close to Mariupol on Monday, bearing symbols of the self-styled Donetsk People's Republic.

When asked about a possible Russian incursion, Mr Lavrov said that "there is enough disinformation".

Ukraine and Western powers have accused Russia of arming the rebels, charges Moscow has denied.

There have been several previous reports of armoured vehicles crossing the border.

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The BBC's David Stern describes how the captured soldiers were marched through Donetsk

Asked about Tuesday's presidential meeting, Mr Lavrov said: "We are ready... for any format as long as there is a result," adding that Russia wanted "to help Ukrainians agree among themselves".

Mr Lavrov also commented on the parading of captured Ukrainian government soldiers by rebels through the centre of Donetsk on Sunday.

Crowds lined the streets chanting "fascists" as the dishevelled-looking prisoners walked by.

Mr Lavrov said this was "nowhere near mistreatment" and that Ukrainian fighters' actions often amounted to "war crimes".

The violence erupted when pro-Russian separatists in the Donetsk and Luhansk regions declared independence from Kiev, after Russia annexed the Crimean peninsula from Ukraine in March.