Today I received a request from the representative of the Ukrainian branch regarding the spelling of Kyiv/Kiev. Kyiv is the official Romanized spelling from the Ukrainian language (as the name is derived from the name of the legendary founder of the city, Kyi), and is used by the Ukrainian government and is the one used by a number of governments, pretty much all major news outlets, and a hefty chunk of international airports.
Before somebody else says it yes there is an absolute fuckton of political context involving Ukrainian national identity and Russian holdovers. However as this is the spelling used by most governments I think it's a SPAG issue.