Ukraine updates: NATO says N. Korea troops escalate conflict

NATO chief Mark Rutte has warned that the alleged deployment of North Korean troops to Ukraine would significantly escalate the conflict. South Korea has summoned the Russian ambassador in protest. DW has the latest.

New NATO leader Mark Rutte says any deployment of troops from North Korea to fight in Russia's invasion of Ukraine would represent an escalation.

Ukrainian President Volodymyr Zelenskyy says North Korea is preparing to send 10,000 soldiers to help Moscow's war effort.

Meanwhile, Seoul has expressed its "grave concerns regarding North Korea's recent dispatch of troops to Russia."

Here's what to know about Russia's war in Ukraine on Monday, October 21: