Will Chalk

member nations haven't been pulling their weight and floating the view that whilst the United States will be there for NATO in times of crisis, NATO may well not be there for the United States.

The fact of the matter, of course, is that the one and only time that NATO has ever enacted Article 5 was after the attacks of 9-11, and the alliance came resolutely to the support of the US.

And in response to the White House's contention that it was President Trump who forced NATO

that enhanced commitment in NATO defence spending.

There are many, I think, who would argue that Russia's invasion of Ukraine did as much, if not more, to focus mines than did the chiding of President Donald Trump.

But there's a feeling, I think, that the President's latest comments have

crossed a line, prompting the very strong suggestion that he apologise.

And that, of course, could always have completely the opposite effect, giving what we know about this president, prompting Mr Trump effectively to double down and giving rise to a new war of words with allies such as the UK.

David Willis speaking to me from Los Angeles.

Russia, Ukraine and the US have held their first trilateral talks to try and bring an end to the war.

Negotiations in Abu Dhabi will resume on Saturday and the issue of territory is very much at the top of the agenda.

Our correspondent Sarah Rainsford has been following developments from Kiev.

The format for these talks is new.

The delegates are senior.

But the starting positions haven't changed and they don't bode well for any breakthrough to peace.

Because Russia is still demanding Kiev surrender the rest of the eastern Donbass, land Ukraine's troops have been defending for years.

And for Kiev, that's impossible.

It is still too early to draw conclusions.

We will see how the conversation goes tomorrow and what the results will be.

But it needs not only Ukraine to want to end this war.