Mosques and immigration centres are being targeted as part of the mass sign-up drive, the Ministry of Defence (MoD) said.
They said the Kremlin wants to recruit 400,000 volunteers to send to the front line, but is wary of provoking “domestic dissent” by introducing mandatory mobilisation.
Details of the recruitment campaign were revealed in the MoD’s latest intelligence update on the war.
It said that immigrants agreeing to join the Russian war effort are receiving bonuses of up to $2,390 and salaries of $4,160 a month.
They are also being offered the chance to become Russian citizens in just six months, rather than the usual five years, if they agree to fight on the front line.
“Recruiting migrants is part of the Russian Ministry of Defence’s attempts to fulfil its target of 400,000 volunteers to fight in Ukraine,” the UK said.
“The authorities are almost certainly seeking to delay any new overt mandatory mobilisation for as long as possible to minimise domestic dissent.”
Meanewhile, the MoD also revealed that Russia is facing its “worst labour shortage in decades” as a result of the war in Ukraine and the Covid-19 pandemic.
Russia’s population has reportedly decreased by two million more people than expected, the MoD said, with 1.3 million leaving the country in 2022 alone.
“Mobilisation, historically high emigration, and an ageing and shrinking population is limiting the labour supply,” they said.
“This will likely lead to a reduction in the potential growth of the Russian economy and risks stoking inflation.”