Minimal progress in another round of peace talks between Russia and Ukraine.  

The two countries have agreed, in Istanbul, to exchange sick and wounded prisoners of war, and those under 25. 

Meanwhile, Ukraine's carried out drone strikes on several Russian air bases.  

BBC's Olga Ivshina says even the loss of one plane is significant, as Russia can't replicate it quickly.  

She told Ryan Bridge Russia has also launched attacks. 

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