Russian President, Vladimir Putin, has vowed that the situation in four regions annexed by Russia will be stabilized.
Putin 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, Mr Putin said he would “calmly develop” the annexed territories.
Chairman of the State Duma defence committee, Andrey Kartopolov, told newsmen that Russia needed to stop lying about what was happening on the battlefield, saying Russians were not stupid.