The European Union Commission has proposed banning Russian coal from the EU - the first time that draft sanctions have targeted Russia's energy.
The commission said it was bringing new sanctions to respond to Russia's "ruthless" and "cruel war", saying that "atrocities cannot go unpunished".
Any ban on Russian coal would cut off four billion euros worth of sales from Moscow, and further hit the already-battered Russian economy. The draft sanctions must go to the EU member states to be voted on, but it's expected that they will vote them through, with only minor changes likely.
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The ban on coal is part of a fifth round of sanctions, which includes another five proposals. Among them, are a transaction ban on four major Russian banks, a ban on Russian vessels entering EU ports, a ban on EU money entering Russian public life, new export bans on certain products and a ban on 5.5 billion euros worth of Russian imports.
Separately, the EU Commission said it would continue discussion on whether to advance a ban on Russian oil, and crucially, whether to start up an 'escrow' account that would put conditions on the EU's payments for Russian gas. The latter is seen as the most significant proposal, though it's not included in the current draft of sanctions.
EU Commission President Ursula von der Leyen said: "We all saw the gruesome pictures from Bucha and other areas from which Russian troops have recently left."
"These atrocities cannot and will not be left unanswered.
"Russia is waging a cruel and ruthless war, not only against Ukraine's brave troops, but also against its civilian population.
"Today, we are proposing to take our sanctions a step further. We will make them broader and sharper, so that they cut even deeper in the Russian economy."
The EU Commission made the announcement as NATO warned that the war in Ukraine was reaching a crucial stage, with Russia expected to launch a big offensive within weeks.
NATO reported that Russian troops are withdrawing from the north and Kyiv, but will mass in the east and south, in order to stage a major attack on the Donbas.
NATO's Secretary-General, Jens Stoltenberg, said that the alliance will continue to support Ukraine, and said that support has included supply of Javelin surface-to-air missiles, air defence systems and cyber technology.
He said that NATO would deepen its ties with Asia-Pacific allies in order to defend democracies around the world.