I have some question about a possible usage error [here](https://en.wikipedia.org/wiki/XYZ_Affair): 

> 
> An American diplomatic commission was sent to France in July 1797 to negotiate ***problems*** that were threatening to ***break out into war***. 
> 
> 
> 

Is it standard English to write "*the problems broke out into war*"? I cannot find this usage of "*break out*" in dictionaries.