It could be diplomatic dynamite.

The first meeting between a sitting US and Russian president in more than four years, following one of the bleakest periods in the history of their countries' bilateral relations.

But a Putin - Trump summit does not necessarily mean there will be a ceasefire.

Ukraine war latest: Kremlin aide's full statement on Trump-Putin talks

On the one hand, it could signal that a point of agreement has been reached and a face-to-face meeting is needed to seal the deal.

That has always been Russia's stance. It's consistently said it would only meet at a presidential level if there's something to agree on.

On the other hand, there might not be anything substantive. It might just be for show.

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