The situation in four regions annexed by Russia will be stabilised, Vladimir Putin has vowed.

The Russian president announced the annexation of Luhansk, Donetsk, Zaporizhzhia and Kherson last week after self-proclaimed referendums, not recognised internationally.

His vow came as Ukraine said it retook villages in Luhansk and Kherson.

It controls significant parts of the other two regions, and has made recent gains in Donetsk.

However, Kremlin spokesman Dmitry Peskov said Russia would retake any territory that had been lost.

Facing questions over the recent losses, he told reporters: "There is no contradiction here. They will be with Russia forever, they will be returned."

In a speech to teachers on Russian teachers' day, Putin said he would "calmly develop" the annexed territories.

But Andrey Kartopolov, the chairman of the State Duma defence committee, told state media that Russia needed to stop lying about what was happening on the battlefield, saying that Russians were not stupid.

Ukrainian forces are making gains in both the south and the east.

Serhiy Haidai, Ukrainian governor of Luhansk, told the BBC on Wednesday that six villages in the region had been recaptured.

And President Zelensky later said Ukraine had liberated three more villages in the southern region of Kherson.

It comes after a series of gains in Kherson the previous day, including the strategically key village of Davydiv Brid.

Russia is still working to mobilise reservists, after Putin announced a call-up last month of 300,000 people who had completed compulsory military service.

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But Putin has rowed back on which groups will be affected, after strong opposition and protests in Russia against the move.

He has signed a decree exempting several categories of students, including first-time students at accredited institutions, and certain types of postgraduate students - such as those in the field of science.

Zaporizhzhia nuclear plant

Meanwhile, Rafael Grossi, the head of UN nuclear watchdog the International Atomic Energy Agency (IAEA), is on his way to Kyiv.

Grossi wrote on Twitter that he was travelling for "important meetings" on the need for a protection zone around the Zaporizhzhia nuclear plant.

The plant, near the front line, has been under Russian control since March. Reports of fighting around it have sparked international concern, and the last of its reactors was shut down last month.

The IAEA, which has two experts onsite, said Ukrainian operating staff are preparing to restart one of the reactors at reduced power to provide heat for the plant.

Earlier, Putin signed a decree saying that the Russian government would integrate the plant's nuclear facilities as Russian property.

But the head of Ukrainian nuclear operator Enerhoatom, Petro Kotin, said that all decisions about the plant's operation will be taken in the company's central office in Kyiv.

"We will continue to work in accordance with Ukrainian legislation within the Ukrainian energy system, in Enerhoatom," he is quoted by the Interfax-Ukraine news agency as saying.