Thousands of North Korean troops in Russia preparing to fight in Ukraine, South Korea says  9NewsAbout 11,000 North Korean soldiers are being trained in Russia, Ukrainian officials claim  ABC NewsSouth Korea summons Russian envoy over North Korean troop deployment  The GuardianZelensky preparing action plan for Ukraine to withstand war, source says.  Kyiv IndependentUkraine could be battleground for North and South Korea  The Canberra Times