The dispute arose in September when Ukrainian President Volodymyr Zelensky announced at the UN General Assembly that his government had sent two captured North Koreans to South Korea. South Korea recalls envoy from Kyiv amid diplomatic tensions over alleged transfer of North Korean soldiers to Seoul. Key points and original sources are listed below.

• The dispute arose in September when Ukrainian President Volodymyr Zelensky announced at the UN General Assembly that his government had sent two captured North Koreans to South Korea.S1

• South Korea recalls envoy from Kyiv amid diplomatic tensions over alleged transfer of North Korean soldiers to Seoul.S2

• President Zelensky revealed last month that two POWs defected to South Korea. South Korea accused him of breaking a confidentiality agreement.S3

• The unusual public confrontation between Ukraine and South Korea has raised questions about how relations between two nations facing the consequences of growing Russian-North Korean military cooperation deteriorated so sharply. Shweta Sharma reportsS4

• The South Korean announcement on Thursday came days after its President Lee Jae Myung threatened unspecified punitive steps if Ukraine refuses to apologize over the revelation.S5