Ukraine’s President Volodymyr Zelenskyy says Ukrainian forces are holding back a concerted summer push by Russia’s bigger army to break through defenses along parts of the front line.

Fox News senior strategic analyst Gen. Jack Keane explains why Russia seems to have no interest in a ceasefire with Ukraine on 'Fox & Friends.'

Negotiators for the warring sides in Istanbul appeared to make little progress on ceasefire terms or a possible summit between their presidents – with their meeting ending after less than an hour.

The long-range Russian drones come in swarms each night, buzzing over Ukraine by the hundreds, terrorizing the population and attacking targets from the industrial east to areas near its western border with Poland.

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.

Ukraine said it is holding back Russia’s summer offensive in eastern regions but has only received pledges from western allies to provide three of the 10 US-built Patriot air defence systems that it needs to shield its cities from missile and drone strikes.