South Korean intelligence suggests that North Korea may deploy North Korean troops to Ukrainian territory, which would represent a significant battlefield inflection. Reuters, citing a South Korean lawmaker privy to intelligence from South Korea’s National Intelligence Service (NIS), reported on June 26 that North Korea may deploy an unspecified number of additional North Korean forces to Russia to fight against Ukraine as early as July or August 2025 and that North Korea continues to arm Russia with artillery ammunition and missiles.[1] The South Korean lawmaker told Reuters that the NIS assessed that Russia may be preparing to initiate a large-scale assault against Ukraine in July or August 2025 and that North Korea is likely receiving technical advice from Russia on satellite launches and missile guidance systems in return. ISW has observed evidence of North Korean forces augmenting Russian forces in Kursk Oblast and North Korea supplying Russia with artillery ammunition and ballistic missiles.[2] Ukrainian forces maintain a limited presence in Kursk Oblast, so North Korean personnel participating in combat operations would most likely be fighting in Ukrainian territory.[3] The North Korean and Russian military commands authorizing the deployment of North Korean forces to Ukrainian territory would mark a significant battlefield inflection that may improve Russian forces’ ability to sustain simultaneous offensive operations in multiple directions, which the Russian military has traditionally struggled to conduct.[4] ISW previously assessed that Russian forces compensated by conducting pulsing, more contained, offensive operations along different sectors of the frontline, but recent reporting indicates that Russian forces appear to be gradually advancing in at least three simultaneous large-scale offensive operations in the Borova-Lyman, Kostyantynivka, and Novopavlivka directions.[5] It is not possible to forecast the likely impact of North Korean support of this type without more information about the size and composition of the North Korean troop contingent that would be going to Ukraine, nor is it clear how rapidly new North Korean troops would become effective in operations alongside Russian troops in Ukraine.
US President Donald Trump and Ukrainian President Volodymyr Zelensky met at the NATO summit on June 25 and discussed possible US sales of Patriot air defense systems to Ukraine and joint weapons production. Trump stated that he and Zelensky did not talk about a possible ceasefire in Ukraine during the meeting, but that Trump may talk to Russian President Vladimir Putin in the near future about a ceasefire.[6] Zelensky stated that he reiterated during the meeting that Ukraine supports the US position on a ceasefire.[7] Zelensky stated that he and Trump discussed the increase in the number of “massive” Russian strikes against Ukraine’s civilian infrastructure and people, and Trump stated that the United States “should consider” selling Patriot air defense systems and missiles to Ukraine as Ukraine’s supply is limited.[8] Trump and Zelensky agreed to continue talks about strengthening Ukraine’s air defense with European partners. Trump and Zelensky also discussed possible joint production of drones and electronic warfare (EW) equipment.[9] Zelensky stated in April 2025 that Ukraine proposed to the United States that Ukraine purchase “30 to 50 billion” (likely USD) worth of air defense and weapons systems from the United States and that Ukraine is prepared to purchase these systems itself — either through direct payment to the United States or through the fund established by the US-Ukrainian minerals deal.[10] Zelensky had stated that Ukraine will consider the provision of at least 10 air defense systems to Ukraine as a “security guarantee.” US Patriot air defense systems are vital to Ukraine’s ability to defend against Russian ballistic missile strikes and will become increasingly important as Russia is reportedly increasing its production and stockpile of ballistic missiles, which would enable larger and more frequent ballistic missile strikes against Ukraine.[11] ISW continues to assess that a strong Ukrainian military backed by Western security guarantees remains the most vital component of a stable post-war European security architecture, guaranteeing a sustainable peace in Ukraine and deterring future Russian aggression.[12]
Key Takeaways:
- South Korean intelligence suggests that North Korea may deploy North Korean troops to Ukrainian territory, which would represent a significant battlefield inflection.
- US President Donald Trump and Ukrainian President Volodymyr Zelensky met at the NATO summit on June 25 and discussed possible US sales of Patriot air defense systems to Ukraine and joint weapons production.
- Kremlin officials continue to platform bellicose rhetoric aimed at undermining Western support for Ukraine and to demonstrate Russia’s uncompromising position on Ukraine.
- Satellite imagery of select armored vehicle repair plants in Russia indicates that Russia continues to rely on refurbishing its Soviet-era stores of armored vehicles.
- Ukraine and Russia conducted the seventh prisoner of war (POW) exchange, in accordance with the June 2 Istanbul agreements.
- Ukrainian forces advanced near Novopavlivka. Russian forces advanced in northern Sumy Oblast and near Toretsk.