ussia plans to increase its own troop numbers in Ukraine by enlisting former soldiers as its losses mount amid the ongoing invasion of the Eastern European country, according to a defense intelligence update from the U.K.

“In response to mounting losses, the Russian armed forces seek to bolster troop numbers with personnel discharged from military service since 2012,” the U.K. Defense Ministry tweeted early Sunday morning, adding that Russia is also trying to recruit troops from Moldova to “generate more fighting power.”

Russia has experienced what Kremlin press secretary Dmitry Peskov called “significant losses” of its own troops. He also told Sky News on Thursday that the Russian military casualties were a “huge tragedy for us” without revealing an exact number.