https://ec.europa.eu/commission/presscorner/api/files/document/print/en/ip_23_4348/IP_23_4348_EN.pdf
https://www.occrp.org/en/investigations/kazakhstan-has-become-a-pathway-for-the-supply-of-russias-war-machine-heres-how-it-works
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf