fighting

"But we're fighting a war against a vicious enemy and we must have the right to use everything we need within the realm of international law to defend ourselves," he said.

It also gives ideas for engineering new immune-cell-based therapies in the laboratory for fighting diseases such as a cancer.

Verified videos from the Kursk region show fierce fighting is taking place - and that Russia is suffering considerable losses in terms of manpower and equipment.

The recent defence of Pokrovsk follows the Ukrainian withdrawal from Avdiivka, just north of Donetsk, back in February after months of fighting.

The Israeli military said 48 soldiers have been killed in the fighting with Hezbollah.