The Challenger 2s, donated by Britain last year, are being operated by Ukraine's 82nd Air Assault Brigade inside the Kursk region.
It is thought to be the first time British tanks have been used in Russia. Yesterday the Ministry of Defence refused to confirm the activity but said it was up to Ukraine how it used weapons supplied by Britain.
A spokesman added: "There has been no change in UK government policy. Under Article 51 of the UN Charter, Ukraine has a clear right of self-defence against Russia's illegal attacks. That does not preclude operations inside Russia.
"We make clear during the gifting process that equipment is to be used in line with international law."
Evacuated
Yesterday Russian bloggers claimed one of the British tanks had been hit by a drone as it raced through Kursk Oblast. This has not been verified.
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