(CNN) — Russian and Ukrainian delegates met in Istanbul on Monday for their second set of direct peace talks , a day after Kyiv launched a shock drone attack on Russia’s nuclear-capable bombers, in an operation that President Volodymyr Zelensky said was a year and a half in the making.

The talks began late and lasted barely over an hour. Although both sides agreed to work on a new prisoner exchange, statements from the two sets of delegations suggested that little had been achieved to bridge the gulf between their positions, particularly on the matter of a ceasefire.

After the initial round of discussions in the Turkish city last month – the first between the warring countries since soon after Russia’s full-scale invasion in early 2022 – both sides agreed to share their conditions f

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