Between 2019, when the procedure was introduced for the residents of Donetsk and Luhansk, and this year, more than 720,000 people living in the rebel-held areas in the two regions - about 18 per cent of the population - have received Russian passports.
In late May, three months after Russia invaded Ukraine, the fast-track procedure was also offered to residents of the Zaporizhzhia and Kherson regions.
The Russian passport move appears to be part of Putin's political influence strategy, which has also involved introduction of the Russian ruble in occupied territory in Ukraine and could eventually result in the annexation of more Ukrainian territory into the Russian Federation. Russia already annexed Ukraine's Crimean Peninsula in 2014.