Purpose This paper aims to study recent approaches to peacemaking, particularly by Turkey and Russia, in a changing world and their implications for UN-led peace processes. The authors analyze the factors that allow parallel processes to UN mediation to emerge and discuss their influence. Design/methodology/approach The paper presents two in-depth case studies of mediation in Syria and Libya, where the UN, as well as Russia and Turkey, were actively involved in peacemaking. Findings The authors find that parallel processes to UN mediation emerge if the UN process does not show progress toward a negotiated settlement and other third parties have leverage over the conflict parties. However, whether these parallel processes pose a fundamental challenge to the UN-led process depends on how sustained the third parties’ leverage over the conflict parties is. If it lasts, it puts the UN in a difficult position to either participate in the parallel process and contain it but thereby also legitimizing it, or to abstain from participating but thereby risking to lose control over the mediation process. Research limitations/implications Analyzing different approaches to mediation helps to better understand current dynamics of multiparty mediation, including an increased questioning of the effectiveness of UN mediation, and provides insights on how the UN may adapt to keep its relevance in a changing world. Originality/value The paper is based on original first-hand data gathered between 2018 and 2022 through more than 50 interviews with UN officials, negotiation team members, political and civil society actors from Syria and Libya, (former) state officials and experts from Russia and Turkey, as well as external observers.