Has the airport ID been positively established?
Possibly
VLXK ??
The runway dimensions at VLXK seem more suited to jet transports:
Runways at Xieng Khouang Airport
07/25
8,555 x 130*ft (2,608 x 40*m) — paved — not lighted
Red arrow below points from THX VOR-DME to VLXK airport;
VLPV is circled in red.
Edit: ASN seems to confirm VLXK:
ASN Aircraft accident Antonov 74TK-300 RDPL-34020 Xieng Khouang Airport (XKH)