Trump's engagement with Zelenskyy had a strikingly different feel to their last Oval Office meeting in February.

BRUSSELS (AP) — NATO defense chiefs were due to hold a virtual meeting Wednesday, a senior alliance official said, as Western countries pushing for an end to Russia’s war on Ukraine devise possible future security guarantees for Kyiv that could help forge a peace agreement.

Just a handful of days after his summit with Vladimir Putin, the US president told Volodymyr Zelenskyy that Ukraine would receive substantial security guarantees as part of the future deal. However, Trump did not specify what it is that Ukraine will be asked to give in exchange.

Ukrainian President Volodymyr Zelenskyy has said at a briefing in Washington following talks at the White House that the exchange of prisoners - both military and civilian - must become an integral part of the negotiation process.

Ukraine's Zelenskyy says constitution prevents territorial surrender to Russia as international leaders discuss potential peace negotiations with Moscow.

Secretary of State Marco Rubio said "both sides are going to have to make concessions" to end Russia's war in Ukraine.

Ukrainian forces have been advancing in areas near Dobropillia and Pokrovsk in Donetsk Oblast for the second consecutive day. Source: Ukrainian President Volodymyr Zelenskyy in a statement after hearing a report from General Oleksandr Syrskyi,

Plans for security guarantees for Ukraine appear to be triggering unease in Moscow, which repeated objections to any role for forces from NATO countries.