Nothing like that, it was a very smart move to lay claim to the two oblasts of Donbass. He'd already successfully secured the Crimea to Russia by democratic means to ensure the Russian southern fleet's security. Now he needs to ensure it further by protecting the Crimea from Ukraine taking it back by force with western military assistance.
At present he can only protect the Crimea from that happening via a vulnerable very long road and rail bridge he built over the entrance to the Azov Sea. By taking over political control of the Donbass region he tempts the Ukraine to increase its fight on the Donbass front line and start killing Russian troops. That would give the excuse for a full blown Russian assault, going beyond the Donbass southern border. Claiming that land gain by right of war then would link Russia directly to the Crimea around the west of the Azov Sea in addition to the eastern bridge. Job done.
This would also weaken the Ukraine through the loss of its Azov Sea ports, those already weakened by the Russians only permitting 16,000 tonne ships through the Azov Sea entrance, far too small to be economic in this container age:
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