NATO Secretary General Mark Rutte on Monday posted on social media a warning to North Korea that sending troops to support Russia in its war against Ukraine would mark "a significant escalation," amid reports that their deployment to Russia's Far East has started.Rutte talked with South Korean President Yoon Suk Yeol on the phone the same day, according to the South Korean government, with Yoon explaining that his country's spy agency had discovered that North Korea had already shipped 1,500 special forces troops to Russia for training.Yoon also told Rutte that South Korea will take "step-b…READ FULL ARTICLE