Above all, we should acknowledge that the collapse of the Soviet Union was a major geopolitical disaster of the century. As for the Russian nation, it became a genuine drama. Tens of millions of our co-citizens and co-patriots found themselves outside Russian territory.

Without condoning, I think I understand his point: Soviet Union was a multi-ethinic country dominated by a Russian ethnic majority (partially due to deliberate ethnic cleansing and genocide).
When Soviet Union collapsed, it was precipitously broken up along administrative or historical internal borders, without giving much thought to the ethnic compositions of the countries that were formed. Russians who found themselves cut off from Russia went overnight from being the dominant ethnicity to being an ethnical minority. I guess they didn't like it.

Putin has a platform based on Russian nationalism, hence catering to the plight of the "co-citizens and co-patriots found themselves outside Russian territory" is natural to him. It panders to his electorate and, should he indeed succeed to annex them, he could probably count them as his supporters.

All of this seems consistent with Putin wanting to annex Russophones, as I said in my comment upthread. He certainly isn't ranting about a divine mission to destroy "the Jew" and reclaim the Lebensraum for a Thousand-Year Empire.