The stage is set in Turkey for a potentially historic meeting in a few hours between the leaders of Ukraine and Russia. 

Ukrainian President Volodymyr Zelenskyy's personally attending and has challenged Russian President Vladimir Putin to do the same. 

It has now been confirmed that Putin will not attend the meeting, but the Kremlin had previously refused to confirm either way. 

BBC Senior Russia Reporter Olga Ivshina told Ryan Bridge that Putin follows his own logic – which is quite unpredictable. 

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