This is the Global News Podcasts from the BBC World Service.

I'm Bernadette Keough, and at 14 hours GMT on Tuesday the 4th of March, these are our main stories.

The US is pausing military aid to Ukraine.

The White House decision immediately blocks American supplies going into the country.

New US tariffs on goods from Canada, Mexico and China have come into effect, prompting immediate retaliation.

Also in this podcast, a report claims half of adults worldwide are predicted to be obese or overweight by 2050.

And can mice give first aid?

We captured detailed behaviors of the cage mate, biting the mouth and the tongue and pulling out the tongue of the unresponsive peer.

Researchers in California say yes.

You don't have the cards.

That's what Donald Trump told Ukrainian President Volodymyr Zelensky

during that diplomatic blowout at the White House on Friday.

Now, Ukraine find itself under huge pressure. The United States has

suspended all military aid and says it will continue to do so until the Ukrainian leader demonstrates

a commitment to negotiating peace with Russia. The suspension includes all American weapons and

equipment that were in transit. Ukrainian officials are in shock.

Alexander Marejko is a member of parliament from President Zelensky's party.

You know, when you take away a weaponry from a person from a country which is fighting for

its survival, you are helping the enemy casualties and human lives lost because of this. I think

Mr. Trump should seriously think about how he's going to enter in history. To me, it's a date

will go down in infamy. Since the invasion in 2022, almost half of military aid going into Ukraine has come from the United States.

Our correspondent in Kiev, James Waterhouse, told me that the US announcement is already being felt on the front line.

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