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Hello and welcome to News Hour from the BBC World Service.
We're coming to you live from London.
I'm James Menendez and we're going to begin today with efforts to end the war in Ukraine as a fourth winter of conflict approaches.
Keeping track of the diplomacy involved,
especially when it comes to Washington's position, is a tricky business.
At the start of the week it was reported that President Trump had, in another fiery encounter,
told his Ukrainian counterpart Volodymyr Zelensky to accept Russia's terms or face destruction.
Now the US has announced that it's imposing sanctions on Russia's two biggest oil companies,
Rosneft and Luke Oil, in order to put pressure on President Putin to agree to... truce.
This was the reaction of President Zelensky.
This is a good signal to other countries in the world to join the sanctions.
You know that not only energy, we need shadow fleet,
etc., and continue and continue until Putin will stop this war.
So these are decisions very important.
Ceasefire is possible, of course, and I think all of us need ceasefire.
But we need more pressure on Russia for ceasefire.
Russia's reacted by saying the sanctions were counterproductive,
that they sent the wrong signal and that anyway,
said a government spokeswoman, Russia had built up a strong immunity to Western restrictions.