Natural language expressions are underspecified and require enrichment to develop into full fledged propositions. Their sense-general semantics must be complemented with pragmatic inferences that have to be systematically figured out and pinned down in a principled way, so as to make them suitable inputs for NLP algorithms. This paper deals with the underspecified ipf1 aspect in Russian and introduces a semantic and pragmatic framework that might serve as the basis for a rule-guided derivation of its different readings.