She fled war to protect her kids. Ukrainian mom now worries about life in US: 'I don't know what to do'

A Pacific breeze wafts through Olga Kovalchuk’s blond hair as she watches her kids play in a San Diego Bay park more than 6,300 miles from their home in Ukraine.

And as she tries to make sense of life as a refugee.  

Last week, the single mom was hunkered with those children in a basement at their apartment complex while bombs and missiles rained over Cherkasy, a city of 278,000 on the Dnieper River.