KYIV – Vasyl Bondar faced a new foe when he came home from a tour of duty in a Ukrainian naval forces unit that included nearly nine months in the frontline Donetsk Oblast town of Shyrokyne where he often faced shelling from Russian-led forces.

Returning to civilian life in November 2016, the 42-year-old native Kyivan started fighting an enemy that was at once invisible and elusive.