https://www.wto.org/english/res_e/booksp_e/oneyukr_e.pdf
https://www.cer.eu/sites/default/files/insight_SL_5.11.19_2.pdf
https://www.politico.eu/wp-content/uploads/2021/11/02/Coercion.pdf
https://www.ceps.eu/wp-content/uploads/2021/03/PI2021-05_The-power-surplus.pdf