Ukrainian drones hit Russia's Sochi resort while Russian forces bombarded Odessa's residential areas and historic Pryvoz market, hours after ceasefire talks collapsed.

Russia and Ukraine discussed further prisoner swaps on Wednesday at a brief session of peace talks in Istanbul, but the sides remained far apart on ceasefire terms and a possible meeting of their leaders.

The United States approved a $322 million arms sale to Ukraine for air defense and armored combat vehicles, following limited progress in recent peace negotiations in Turkey.

The two sides made little progress toward a ceasefire — despite President Trump's threats of harsh new economic penalties on Moscow should it fail to agree to a deal by early September.