Select Count of one table into another
Try the following:

SELECT   ART.NEWS_ARTCL_ID, ART.NEWS_ARTCL_TTL_DES,
         ART.NEWS_ARTCL_CNTNT_T, ART.NEWS_ARTCL_PUB_DT,
         ART.NEWS_ARTCL_AUTH_NM, ART.NEWS_ARTCL_URL,
         ART.MEDIA_URL, ART.ARTCL_SRC_ID, SRC.ARTCL_SRC_NM,
         MED.MEDIA_TYPE_DESCRIP, LIK.TOTAL
FROM     RSKLMOBILEB2E.NEWS_ARTICLE ART,
         RSKLMOBILEB2E.MEDIA_TYPE MED,
         RSKLMOBILEB2E.ARTICLE_SOURCE SRC,
         (SELECT   AR1.NEWS_ARTCL_ID, COUNT(*) TOTAL
          FROM     RSKLMOBILEB2E.NEWS_ARTICLE AR1,
                   RSKLMOBILEB2E.NEWS_LIKES LK1
          WHERE    AR1.NEWS_ARTCL_ID      = LK1.NEWS_ARTCL_ID) LIK
WHERE    ART.MEDIA_TYPE_IDENTIF = MED.MEDIA_TYPE_IDENTIF
AND      ART.ARTCL_SRC_ID       = SRC.ARTCL_SRC_ID
AND      ART.ARTCL_SRC_ID       = 1
AND      ART.NEWS_ARTCL_ID      = LIK.NEWS_ARTCL_ID
ORDER BY ART.NEWS_ARTCL_PUB_DT;