U . S . commander : N . Korea is ' what I ' m concerned about most nights ' WASHINGTON , April 4 ( Yonhap ) -- The commander of the U . S . Strategic Command said Tuesday that North Korea is what he ' s concerned about " most nights " because it ' s hard to predict what the communist nation will be doing . Air Force Gen . John Hyten , commander of the U . S . Strategic Command , told a Senate Armed Forces Committee hearing that Russia represents the " greatest threat " to the U . S . , but the actions of Russia as well as China are predictable , compared with the North . " What I ' m concerned about most nights is North Korea . .. I ' m not sure exactly ( what ) they ' re going to do tonight , " Hyten said . " Every time there ' s a launch , February 11 th , March the 5 th this year , the whole network comes up , we bring the entire power of my command to bear on the problem . " The commander said it ' s " very difficult " to understand " what impacts ( North Korean leader ) Kim Jong - un . " Hyten stressed that whatever action the U . S . takes should be in line with allies South Korea and Japan because the North ' s in the backyard of the allies . He also said he ' s ready to provide " military options " to the president " if he deems in association with Congress that there ' s something that we have to do . " He added , however , that he believes any solution to the North Korean problem should involve China . " I can ' t see a solution that doesn ' t involve China , " he said . " China is the definition of North Korea ' s backyard . And so the trade that North Korea has really goes north across the Chinese border and south from China into North Korea . That is a significant element . " U . S . Air Force Gen . John Hyten , commander of the U . S . Strategic Command , speaks during a Senate Armed Forces Committee hearing on April 4 . jschang @ yna . co . kr ( END )