It is hard to see how a vote can take place when Ukraine still controls much of the Donetsk and Zaporizhzhia regions. [Source: BBC News]

Four areas of Ukraine under Moscow’s control have announced plans for urgent so-called referendums on joining Russia, which would pave the way for Russian annexation.

Russia’s invasion has stalled in recent months and Ukraine has recaptured swathes of territory in the northeast.

Now Russian-backed officials in the east and south say they want votes on joining Russia starting this week.

Russia annexed Crimea in 2014 after a vote drew international condemnation.

Russian President Vladimir Putin had been expected to give an address to the nation on Tuesday evening but sources close to the Kremlin indicated later that it had been postponed, with no reason given.

Ukraine’s Foreign Minister Dmytro Kuleba said on Tuesday that “sham ‘referendums’ will not change anything”.

The international community has never recognised the Crimea annexation, but it has long been clear that Russia intends to rubber-stamp its takeover of other occupied regions in the same way.

Annexing more Ukrainian territory would enable the Kremlin to claim Russia itself was coming under attack from Nato weapons. Russia launched its invasion on 24 February.

There is speculation that Russia may announce a mass mobilisation, to beef up its forces in Ukraine. The Russian parliament has approved tougher punishments for crimes such as desertion, damage to military property and insubordination during mobilisation or combat operations.

The deputy head of Russia’s Security Council, Dmitry Medvedev, said early on Tuesday that holding votes in the eastern regions of Donetsk and Luhansk – also known as Donbas – would correct “historical justice” and be irreversible: “After the amendments to the constitution of our state, no future leader of Russia, no official, will be able to reverse these decisions.”

Soon afterwards the two breakaway Russian-backed authorities in Donetsk and Luhansk said they would stage votes on 23-27 September. They were both recognised as independent by President Putin three days before Russian troops invaded Ukraine from the north, east and south.

Russian-installed officials in the southern region of Kherson said they would also hold a vote, and a similar declaration came from Russian-occupied areas of Zaporizhzhia. Russian state media said people would be able to vote in person or remotely.

For months, Russian-installed authorities have tried to hold self-styled referendums. There was never any hope of a free or fair vote, and the continuing war has made it impractical even to try to annex areas not fully under their control. Ukraine’s counter-offensives have made that harder still.

While most of Luhansk has been in Russian hands since July, on Monday the Ukrainian leader in Luhansk announced that the army had recaptured the village of Bilohorivka.