Red Square closed ahead of annexation celebration

STORY: The annexation, after what Kyiv and Western countries say were phoney referendums staged at gunpoint on Russian-held Ukrainian territory, has been rejected in the West as an illegal land grab.

After days of speculation over exactly how Russia would mark the annexation, Putin's spokesman Dmitry Peskov confirmed some details of the ceremony on Thursday.

Agreements "on the accession of new territories into the Russian Federation" will be signed "with all four territories that held referendums and made corresponding requests to the Russian side," Peskov said.

Putin would deliver a major speech on the subject, he added.