Russia's Vladimir Putin will hold a signing ceremony on Friday formally annexing four more areas of Ukraine after self-styled referendums condemned by Ukraine and the West as a sham.
Russian-backed officials had earlier claimed the five-day exercise secured almost total popular support.
So-called votes were held in Luhansk and Donetsk in the east, and in Zaporizhzhia and Kherson in the south.
The Russian president will make a major speech at the Kremlin.
A stage has already been set up in Moscow's Red Square, with billboards proclaiming the four regions as part of Russia and a concert planned for the evening.
The event echoes Russia's annexation of Crimea in 2014, which also followed a discredited referendum and was heralded by a presidential victory speech from a stage. That initial annexation has never been recognised by the vast majority of the international community. There is no confirmation that Mr Putin is planning a similar outdoor address.
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