Yes is the simple answer, those annexations wont be recognized as Russian lands, so Ukraine wont be told to stop. ( As they would if they crossed the recognized borders )
Either someone in the Russian Leadership wants a faster pace, or it is an attempt to see if someone cooks something up the Russian can use or havent thought about so they have more options. ( like in the other bluff instances )
If they declare full mobilisation later today, all neighboring contries have to do at least a partial mobilisation. Its the last big wheel for a contry that prepares for a major war, and takes time to effectively start up ( so we wont see its effect until next year ) Something else I have thought about and not been brought up, is the Alliance Defence system Russia has with its allies. People focus on the nuke use, and full mobilisation, but havent realized that Russia can also claim that they are being attacked so their allies need to come help ( Mainly addressed to China ) What will happen if they dont Fully mobilise but call on China? Will China then send a million "voluntiers"? and alot of other questions will present itself,