That comes over as a little ignorant; which is akin to your name being 'David', but I insist on calling you 'Dean' saying that nobody should tell me what to call you as 'no offence was meant'.
By your token you can also continue to call; Zimbabwe as Rhodesia, Sri Lanka as Ceylon, Myanmar as Burma, Thailand as Siam etc. If the Ukrainians want people to call 'Kiev', 'Kyiv' then that's the least I can do, especially as they are being currently invaded by the country that insists on it being called 'Kiev'
https://en.wikipedia.org/wiki/KyivNotKiev#:~:text=Previously, most airports refused to,Geographic Names, switched to Kyiv.
To be honest, I had just assumed that Kiev wss the English version of Kyiv. A bit like Munich being the English version of Munchen etc, I call it Munich not Munchen , likewise I call it Spain not Espana and Rome rather than Roma.