Key developments on Oct. 30: North Korean soldiers 50 km from Ukraine’s border, including special forces, FT reportsUkraine should strike back if North Korean troops cross into its territory, Biden saysNo confidentiality between partners — Zelensky calls out White House over Tomahawk missiles leakKremlin denies Russia-Ukraine talks on halting energy strikesSouth Korea reportedly not considering direct 155 mm ammunition supplies to UkraineAround 3,000 North Korean troops who arrived in Kursk Oblast were housed in barracks only 50 kilometers (30 miles) from the Russia-Ukraine border, the Financi…