Russia editor, BBC Monitoring

More now from the ground.

Kyiv says up to 30 Russian troops were killed in an air strike on an “element of military infrastructure” in Russia’s Kursk region.

“As a result of the strike it was completely destroyed,” the Ukrainian General Staff says in a statement, adding that the strike “degrades the enemy's ability to conduct operations against Ukraine's Defense Forces in Sumy and Kursk regions”.

Ukraine launched an incursion into Kursk region in August last year, but over the recent weeks its forces have been withdrawing under pressure from the Russians.

Both Russia and the US claim significant numbers of them were surrounded in Kursk region, but Ukraine denies this.

Russia editor, BBC Monitoring

Ukraine’s air force says Russia used 139 drones and one Iskander ballistic missile in overnight attacks.

According to the statement issued this morning, it shot down 78 drones, while another 34 were dummy drones not carrying explosives and did not cause any damage.

It does not say what happened to the remaining 27 drones or the missile, which suggests they likely reached their targets.

Security correspondent, reporting from Riyadh

This has been an intense round of talks and negotiations here in Riyadh as the US delegation strives to achieve at least a partial ceasefire in this war.

The US team spent 12 hours yesterday closeted with the Russian team inside a luxury hotel.

Their talks focussed on reaching a ceasefire in the Black Sea where Ukraine’s missiles and underwater drones have severely damaged Russia’s navy.

Moscow is reportedly keen to revive a Black Sea grain deal that allows both countries, Russia and Ukraine, to export produce by sea, without being attacked.

Other topics, discussed in talks between the US and Ukrainian delegations, include naming certain energy plants to be off-limits for attack.

If even a partial ceasefire can be reached for these limited goals then these Riyadh talks will constitute progress.

Negotiations between Russia and the US in Saudi Arabia were "useful", Russian media cites a Kremlin negotiator as saying.

Grigory Karasin, chairman of the Federation Council Committee on International Affairs, who took part in the talks in Riyadh, tells Russia's state-owned news agency Tass: "[We] discussed everything, and the dialogue was detailed and complex but quite useful for us and for the Americans."

He adds: "We discussed numerous issues."

Live reporter

The US and Russia are expected to release a joint statement today, the BBC's US partner, CBS News, reports.

Delegations from the US, Ukraine and Russia have been holding talks at the Ritz-Carlton hotel in Saudi Arabia for the past two days.

Washington is attempting to broker a ceasefire, and despite the negotiations being carried out in the same hotel, the Ukrainian and Russian delegations are not meeting one another.

The US team spent Monday locked in talks with the Russian delegation - top of the agenda was reportedly the revival of a 2022 deal allowing ships to freely navigate in the Black Sea.

The two are expected to release a statement at around 08:00 GMT.

Meanwhile, in DC yesterday, Trump told reporters he expects a deal giving US firms access to Ukrainian critical minerals will be signed "very soon".

We'll be bringing you updates, analysis and reaction as events unfold today - stick with us.