in due time all websites will list it under Russia.
Only the Russian websites will do so. The rest will list it as "Ukrainian territory under Russian occupation". Unwieldy, perhaps, but reflecting the truth.
Or, as they keep saying about Jerusalem, it will go something like this: "Annexed by Russia in a move not recognized internationally."
Did most websites - read organizations - recognize Estonia, Latvia & Lithuania - as independent, but under Soviet occupation, during the Cold War? Do most websites - or organizations - recognize Tibet as an independent country under Chinese occupation? The US recognized and recognizes all of them as occupied but independent, but was that true about anyone else?
Jerusalem has always been a part of Israel. Only disputed part was East Jerusalem, which was a part of Jordan before the Six Day War, and became a part of Israel after that. Unlike the rest of Judea & Samaria, Israel annexed East Jerusalem, just like they did the Golan Heights, so both territories are legitimately part of Israel. Yeah, the rest of the world disputes it, but a good portion of them are in bed w/ the OIC, which in fact recognizes all of Israel as 'Palestine', and would like to replace Israel w/ a Pali state.
If anyone disputes that, they might also want to dispute territorial ownership elsewhere in the world, such as Srpska, whose status is identical to the Crimea, except that Serbia isn't as militarily powerful to reclaim it, the way Russia is for Crimea.