"The scale of deployed North Korean troops is being closely watched," Yoon Yeocheol, South Korea's ambassador to the U.K., told Newsweek.

The United States said on Monday it was Russia that is escalating the conflict in Ukraine by deploying North Korean troops, after the Kremlin warned that Washington would deepen its involvement in the war by allowing Kyiv's forces to strike far into Russia with U.

President Joe Biden authorized Ukraine to use U.S.-supplied long-range missiles inside Russia for the first time Sunday, according to multiple reports—an escalation of U.S. involvement in the conflict in response to North Korean troops being sent to aid Russia.

South Korea was given prior notice by the United States on its reported decision to allow Ukraine to use long-range missiles to strike inside Russia, the presidential office said Monday.

The decision by Biden to approve the use of long-range missiles inside Russia could mark a turning point in the conflict

US President, Joe Biden, has lifted restrictions on Ukraine's use of long-range missiles only in the Kursk region of Russia. According to the Axios media outlet, the decision was taken around three days ago.

North Korea is considering sending up to 100,000 soldiers to support Russia on the front lines in its fight against Ukraine. According to Bloomberg, intelligence data suggests this plan. Such a move could bolster the Kremlin's combat forces by up to 20%.

North Korea is considering sending up to 100,000 soldiers to support Russia on the front lines in its conflict with Ukraine. According to Bloomberg, intelligence data suggests this plan. Such a move could augment the Kremlin's combat forces by up to 20%.