POTENTIAL CONFLICT LTSS WITH XING DSNDING TFC. TCASII RA SAVES THE DAY AS TRACON APCH CTLR COMES IN WITH A LATE AMENDED CLRNC ALT CHANGE. FOREIGN AIRSPACE.

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ON DSCNT INTO YOKOTA AIR BASE; JAPAN; TOKYO CTR GIVES US CLRNC TO CROSS XMC VOR AT FL170. DUE TO TAILWINDS WE IMMEDIATELY ADVISED TOKYO CTR THAT WE WERE UNABLE TO CROSS AT FL170 BUT COULD AT FL200 DSNDING TO FL170. CLRNC WAS GRANTED DOING JUST THAT. AFTER XMC VOR ROUTING WAS DIRECT PONY DIRECT YOKOTA. ON THE WAY N TO PONY; TOKYO ATC CLRED US TO FL150 WITH A HDOF TO YOKOTA APCH. YOKOTA CLRED US TO 5000 FT. SHORTLY AFTER THIS THE TCASII (WHICH WAS IN ON POS NOT AUTOMATIC; WHICH GIVES US BETTER TFC AWARENESS) CALLED OUT TFC 1 O'CLOCK; 6 MI; 900 FT; THEN YOKOTA APCH CALLED WITH A REVISED CLRNC TO STOP THE DSCNT AT FL140. WE WERE ALREADY AT 13700 FT DSNDING RAPIDLY AND RESPONDED 13700 FT CLBING TO FL140. THIS WAS ALMOST IMMEDIATELY FOLLOWED BY AN RA 'CLB; XING; CLB' WHICH WE COMPLIED WITH IN CONJUNCTION WITH APCH CTL'S PRIOR REQUEST CLRNC. AT FL140 WE SAW A C-141 GO BY AT 13000 FT. THE C-141 WAS WITH APCH CTL ON THE SAME FREQ AND APCH WAS HAVING DIFFICULTY GETTING A HOLD OF THEM. THE C-141 DRIVER THOUGHT WE HAD BUSTED AN ALT. APCH CTL WAS GLAD THAT THE FREQ WAS CLR AND WE WERE THANKFUL FOR TCASII AND VFR CONDITIONS. THE TCASII MADE THE CLOSE CALL COMFORTABLE -- BUT NOT RIGHT.