The claim by the General Staff of the Ukrainian armed forces, which came on a holiday celebrating Russia's sovereignty, is in line with Western intelligence estimates.

All of the Ukrainian troops need treatment, Ukraine's President Volodymyr Zelenskiy said in a message on the Telegram messaging app.

Russian forces have advanced into Dnipropetrovsk and Sumy regions, in fresh bid for Ukrainian land beyond what Moscow's already annexed.

It is designed to make the West think a Kremlin victory is inevitable.

A new prisoner swap between Ukraine and Russia has begun, officials in both countries said Monday, with Ukrainian soldiers who have spent nearly the entire duration of the war in captivity among those returning home.

Trump has generally veered away from overtly criticizing Putin while openly berating Ukraine's leader Volodymyr Zelensky, but has repeatedly condemned Russia's lethal airstrikes and floated that the Kremlin could be "tapping us along."

Apart from drones, 20 missiles of various types were fired at different parts of Ukraine, according to the air force, which said the barrage targeted mainly central and western areas of Ukraine.

The region of Transcarpathia has seen hardly any Russian attacks over the past three years. “We don’t have the same experience of war,” a resident said.

As the Ukraine war grinds on with little sign of Russian president, Vladimir Putin agreeing to a ceasefire we trace the evolution of his attitude towards Ukraine. David Aaronovitch spoke to Vitaly Shevchenko who is Russia editor for BBC Monitoring and co-presenter of the BBC’s Ukrainecast.