Assertion: blockade | /r/CapableOf | begin at the end of june
Facets:
value: by the time
type: TEMPORAL
Source sentences:
text: Some 20 flights a day continued through June, building up stocks of food against future Soviet actions, so that by the time the blockade began at the end of June, at least 18 days' supply per major food type, and in some types, much more, had been stockpiled that provided time to build up the ensuing airlift.