(2nd LD) N Korea-Russia-US(2nd LD) U.S. concerned about burgeoning defense cooperation between N. Korea, Russia: White House(ATTN: UPDATES with remarks from Secretary of State Blinken, minor edits in paras 11-16)By Byun Duk-kun, Song Sang-ho WASHINGTON, Sept. 13 (Yonhap) -- The United States is concerned about growing defense cooperation between North Korea and Russia, a National Security Council (NSC) official said Wednesday, adding the U.S. will take appropriate steps if necessary to counter any potential arms deal between the two countries.

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