Ukraine accepts US proposals for an initial ceasefire

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  Hello and welcome to NewsHour from the BBC World Service.

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  We're coming to you live from London.

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  I'm James Menendez.

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  In a moment, after Ukraine agrees to an initial ceasefire with Russia,

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  the US Says it's now Moscow's move.

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  We'll hear from there.

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  Also in the programme,

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  as US tariffs on steel and aluminium imports come into force

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  and other countries threaten retaliation,

• 00:25

  we'll ask what is President Trump's broader economic goal

• 00:29

  and the technological challenges of perfecting an artificial human heart?

• 00:34

  The biggest problem about this technology for a total artificial heart,

• 00:39

  has been matching the two sides of the heart, if you get it wrong by about 5 mils of blood.

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  You know, that's 500 liters over a day.

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  You know, small paddling pools worth of blood.

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  That's different.

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  So it's really, really, really tight tolerances there.

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  More on that coming up in just over 15 minutes.

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  But we are going to begin today in Russia.

• 01:09

  That's the opening of the state owned TV Channel one this morning

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