For all the noise that India made initially, it is Russia that has now launched the first formal #WTO complaint about the EU’s #CBAM.
https://www.wto.org/english/news_e/news25_e/ds639rfc_19may25_e.htm
https://docs.wto.org/dol2fe/Pages/FE_Search/FE_S_S009-DP.aspx?CatalogueIdList=315550

Russia initiates WTO dispute regarding EU’s carbon border adjustment and emissions trading
The Russian Federation has requested WTO dispute consultations with the European Union and member states concerning the EU’s “Carbon Border Adjustment Mechanism (CBAM) Package” and alleged export subsidy under the EU scheme for trading greenhouse gas emission allowances. The request was circulated to WTO members on 19 May.