Footage shows the blinding explosions caused when two Russian rockets slammed into a building full of humanitarian supplies in besieged Mykolaiv.

The footage was released by Vitaliy Kim - the governor of Mykolaiv Oblast - on July 21.

Governor Kim, 41, said: ‘And this is the moment of the strike.

‘Yes, at 3 am, the Russian occupiers hit one of our humanitarian headquarters with two rockets.

‘Thousands of tonnes of products intended for children, the elderly and those who need help were completely burnt.'

The footage clearly shows the two rockets plummeting to the ground and causing massive explosions.

The governor became a popular figure across Ukraine after the invasion began due to his wit and mockery of the Russian Army.

His office in Mykolaiv was hit by a Russian missile in an airstrike on March 29 that killed at least 37 people.

The provincial capital remains in Ukrainian hands but lies close to the front line.

Russia invaded Ukraine on February 24 in what the Kremlin called a 'special military operation'.

CIA chief William Burns said on Wednesday that there is no intelligence that Russian President Vladimir Putin is in bad health or unstable.

It has long been rumoured in Western media that President Putin, 69, has been suffering from ill health, possibly cancer.

But Burns joked that the Russian president appeared ‘too healthy', adding: ‘He is convinced that his destiny as Russia's leader is to restore Russia as a great power.

‘He believes the key to doing that is to recreate a sphere of influence in Russia's neighbourhood and he cannot do that without controlling Ukraine.'

Burns said the USA believes Russia has so far lost around 15,000 soldiers in Ukraine, with some 45,000 wounded.

Washington announced on Wednesday that it would provide Ukraine with more long-range weapons.

This was despite an apparent warning from Russian Foreign Minister Sergey Lavrov that such an act would broaden Moscow's military focus in Ukraine.

A report released on Wednesday by the Office for Democratic Institutions and Human Rights said Russian troops committed serious rights violations in Ukraine.

The Warsaw-based office cited cases including the shelling of a theatre in Mariupol in mid-March and of Kramatorsk train station in early April.

Both of these incidents resulted in civilian deaths and may amount to Russian war crimes, said the institution.

The report also detailed witness reports of illegal executions, detentions, abductions, and cases of torture and sexual violence.