A large-scale prisoner exchange between Russia and Ukraine -- the only concrete outcome of peace talks -- was in doubt Saturday after Moscow and Kyiv accused each other of delaying and thwarting the swap.

The hold-up to an exchange that both sides said would take place this weekend came hours Moscow's army launched a barrage of missiles, drones and bombs across the country.

At talks in Istanbul on Monday, Kyiv and Moscow agreed to release all wounded soldiers and those aged under-25 that had been captured -- more than 1,000 people on each side.

Russia said it would also hand back 6,000 killed Ukrainian soldiers.

Moscow on Saturday accused Ukraine of not turning up to collect the dead bodies and not agreeing a date to swap the captured soldiers, while Kyiv said Russia was playing "dirty

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