North Korea has sent dozens of powerful rocket artillery systems to Russia for the first time, according to a Ukrainian official, a development that one expert said could provide a significant advantage to Russia on the battlefield.

In a Telegram post on Friday, Ukrainian official Andrii Kovalenko said the DPRK has transferred the M-1991 240mm multiple launch rocket systems (MLRs) as part of a shipment of hundreds of units of military equipment, citing the Kyiv’s defense intelligence service.

The shipment also featured M-1989 Koksan self-propelled gunspreviously spotted in Russia, as well as 100 KN-23 medium-range missiles and “at least