This article was submitted in late 2021, and became dated after Russia's demonstrative preparation as well as start of an open, large-scale invasion of Ukraine early 2022. We nevertheless publish this commentary here in order to document the debate about the events leading to the escalation. No adaptations to the original 2021 article were made after the outbreak of high-intensity war on 24 February 2022. Avoiding a larger military escalation in the Russian–Ukrainian conflict is an important aim. Yet, historical experience suggests that concessions by Ukraine or its Western partners toward Russian revanchist aspirations in the Donbas may not help achieve it. On the contrary, Western softness, and Ukrainian weakness vis-à-vis the Kremlin will lead to further confrontation.