The Russian invasion of Ukraine has highlighted the need for corporate human rights and environmental due diligence legislation. Future private sector preparedness requires a harmonised standard of responsible business conduct. The Russian war in Ukraine has, in addition to the COVID-19 global pandemic, once again highlighted the need for corporate human rights and environmental due diligence (HREDD) regulation, such as the proposed EU Corporate Sustainability Due Diligence Directive (CSDDD). Future private sector preparedness in the face of such crises requires a harmonised standard of responsible business conduct in order to help direct corporate behaviour and to ensure companies do not contribute to armed conflict, or otherwise exacerbate crises.