The Ukrainian armed forces have this morning estimated that 13,500 Russian soldiers have been killed so far in the conflict.

This is far higher than the only number to be confirmed by Moscow, which put the death toll below 500 at the start of March.

Meanwhile, Ukraine says it has shot down four Russian helicopters, one plane, and a fighter jet in the last 24 hours.

In total, it claims to have destroyed 95 Russian helicopters and 81 aircraft.

Ukraine adds that Russia “did not have significant success in all areas of advance” on Monday.

“The main efforts continue to be focused on maintaining the occupied borders,” the Ukrainian armed forces said. “The enemy continues to launch missile and bomb attacks on critical infrastructure.”