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обстоятельство, при наступлении которого stresses
gen.	condition precedent (Condition precedent (CP) refers to an event or state of affairs that is required before something else will occur. In contract law, a condition precedent is an event which must occur, unless its non-occurrence is excused, before performance under a contract becomes due, i.e., before any contractual duty arises (WAD) Alexander Demidov)
обстоятельства, при наступлении которых
gen.	conditions precedent (Conditions precedent for commencement of mining ...Conditions precedent for aid to non-Federal lands ... Alexander Demidov)