The US has imposed sanctions against Russian President Vladimir Putin's inner circle, including his daughters.

The list also includes the family of Foreign Minister Sergei Lavrov and major banks.

The measures follow new revelations of atrocities by Russian troops in Ukraine, including images of bodies of civilians scattered on the streets of Bucha, near the capital Kyiv.

Russia says, without evidence, the images are staged by Kyiv officials.

Even though satellite images have shown the civilians were killed when Russians were in control of Bucha, Mr Putin on Wednesday described the event as a "crude and cynical provocation by the Kyiv regime".

Referring to the Bucha murders, US President Joe Biden said on Wednesday: "There's nothing less happening than major war crimes."

"Responsible nations have to come together to hold these perpetrators accountable," Mr Biden added.

The US said that Mr Putin's daughters, Katerina Vladimirovna Tikhonova and Maria Vladimirovna Vorontsova, were being put under sanctions "for being the adult children of Putin, a person whose property and interests in property are blocked".

The announcement described Ms Tikhonova as "a tech executive whose work supports the GoR [Russian government] and defense industry".

Her sister, Ms Vorontsova, it went on, "leads state-funded programs that have received billions of dollars from the Kremlin toward genetics research and are personally overseen by Putin".

Asked why the US was targeting Mr Putin's daughters, a senior Biden administration official said the US thought they could be in control of some of their father's assets.

"We have reason to believe that Putin, and many of his cronies, and the oligarchs, hide their wealth, hide their assets, with family members that place their assets and their wealth in the US financial system, and also many other parts of the world," the official said.

"We believe that many of Putin's assets are hidden with family members, and that's why we're targeting them."

The US sanctions announced by the White House include:

Meanwhile the UK has announced further sanctions against eight oligarchs and Russian banks, including the country's largest, Sberbank, and Credit Bank of Moscow.

The European Union is also debating cutting off Russian coal imports as concern over alleged war crimes increases.

Before the new raft of sanctions was announced in Washington, Ukrainian President Volodymyr Zelensky said he could not "tolerate any indecisiveness".

Speaking to the Irish parliament on Wednesday, he said there was still a need to convince some in Europe who believe "war and war crimes are not as horrific as financial losses" to back tougher sanctions.

He added that "Russian oil cannot feed the Russian military machine", with Ukraine's foreign minister arguing on Twitter that an embargo on gas and oil was needed to truly impact Russia's ability to finance the war.

Josep Borrell, the EU's chief diplomat, separately acknowledged on Wednesday that the one billion euros ($1.09bn; £833m) Europe spent on Russian energy every day put into sharp perspective the billion euros given to Ukraine in military assistance since the start of the invasion.

However, in a first, the European Commission proposed a potential ban on imports of Russian coal on Tuesday, which must be agreed by all 27 members. Europe buys around €4bn ($4.4bn; £3.3bn) worth of coal from Moscow every year.

Sentiment appeared to change after evidence of Russian war crimes emerged, with French President Emmanuel Macron joining calls for a ban on coal earlier this week.

The ban was suggested ahead of a range of sanctions set to be announced in coordination with the US and other G7 nations.

European member states are also expected to impose a "full transaction ban" on four Russian banks and ban a range of other Russian and Belarusian imports, including wood, cement, seafood and liquor, worth €5.5 billion ($6bn; £4.59bn).

And Ursula von der Leyen, the European Commission president, said she intends to close EU ports to Russian vessels and ban Russian and Belarusian road transport operators from the region.

Ms Von der Leyen accused Russia of "waging a cruel and ruthless war" against Ukrainian civilians and said the EU must "sustain utmost pressure on Putin and the Russian government at this critical point".

But Lithuanian Foreign Minister Gabrielius Landsbergis on Tuesday evening criticized the EU's proposed sanctions package, calling it a "feeble response" which is "an invitation for more atrocities."

"Coal, four banks…a ban on ports and borders (with exceptions) is not really an adequate sanctions package to the massacres that are being uncovered," Mr Landsbergis wrote on Twitter.