I asked about it on SE, https://law.stackexchange.com/questions/64179/does-acceptanc..., and there doesn't seem to be a way that this could have been legally accomplished without at the least rescinding recognition of Ukranian sovereignty over Crimea.
Which would imply, since all UN countries recognize RIPE NCC as the final and exclusive authority on internet allocation matters in the European region, that the world has stopped recognizing Crimea as Ukrainian, via one degree of separation.