The red areas are all those areas that went to Poroshenko. The grey is where no election was held. Even with those gray parts, there was record breaking turnout.
Ceding any part of Ukraine when the people do not want it is just stupidity. The Ukrainian government understands it, and that is why there will be no annexation. Russia's only option is to invade. Their propaganda war is falling apart since the facts on the ground are so contrary to their claims that even the Russians in Russia are catching on, despite a constant onslaught by their state controlled media.