The top national security officials of Japan, the United States and South Korea on Friday expressed "grave concern" about North Korea's recent deployment of troops to Russia, possibly to join its war against Ukraine, the White House said.It said Jake Sullivan, U.S. President Joe Biden's national security adviser, agreed in Washington with his Japanese and South Korean counterparts, Takeo Akiba and Shin Won Sik, respectively, that such actions could "expand the security implications" of the war beyond Europe and into the Indo-Pacific region.On the eve of their discussions, an official said o…READ FULL ARTICLE