The United Nations’ nuclear watchdog says missiles have hit a radioactive waste disposal site in the Ukrainian capital of Kyiv.

In a statement late on Sunday, International Atomic Energy Agency director general Rafael Grossi said Ukrainian authorities informed his office about the overnight strike, but there are no reports of damage to the buildings or indications of a release of radioactive material.

He said his agency expects to soon receive the results of on-site radioactive monitoring.

The report came a day after an electrical transformer at a similar disposal facility in the Ukrainian city of Kharkiv was damaged.

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Such facilities typically hold low-level radioactive materials such as waste from hospitals and industry, but Mr Grossi said the two incidents highlight a “very real risk”.

He said if the sites are damaged there could be “potentially severe consequences for human health and the environment”.

Next 24 hours “crucial” for Ukraine

Boris Johnson has told President Volodymyr Zelensky he will do “all he could” to ensure further military aid reaches Ukrainian forces, Downing Street has said.

The Prime Minister spoke to the Ukrainian president again on Sunday, praising the “heroic” resistance of the Ukrainian people in the face of the Russian attack, according to the No 10 readout of the call.

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Mr Zelensky said, in turn, that the next 24 hours will be “a crucial period” for his country.

“The Prime Minister lauded the bravery of the Ukrainian people following the Russian invasion and praised the leadership of President Zelensky in the face of such adversity,” a No 10 spokesman said. “The resistance of the Ukrainian people was heroic, the Prime Minister added.

“President Zelensky said he believed the next 24 hours was a crucial period for Ukraine, and the Prime Minister said he would do all he could to help ensure defensive aid from the UK and allies reached Ukraine.

“The leaders agreed to continue to stay in close contact and the Prime Minister reiterated the UK’s staunch support for Ukraine’s sovereignty.”

Are sanctions on Russia working?

The Russian rouble sank nearly 26% against the US dollar early on Monday after Western nations moved to block Russian banks from the Swift global payment system.

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The rouble was trading at a record low 105.27 per dollar (£78.95), down from about 84 per dollar (£63) late on Friday.

Over the weekend, Japan joined the moves by the US and other western nations to impose more sanctions against Russia.

Restrictions on the Russian central bank target its access to more than 600 billion dollars (£450 billion) in reserves the Kremlin has at its disposal. They hinder Russia’s ability to support the rouble as it plunges in value.

Sanctions announced earlier had taken the Russian currency to its lowest level against the dollar in history.