American fighters are dying in Ukraine in growing numbers. Bringing their bodies home is a complex task

More than 20 Americans are missing in action on the front lines in Ukraine, with a spike in casualties over the past six months as foreigners fill urgent gaps in defenses, according to a CNN investigation.

​ More than 20 Americans are missing in action on the front lines in Ukraine, with a spike in casualties over the past six months as foreigners fill urgent gaps in defenses, according to a CNN investigation. Read More Breaking News, Latest News and Videos | CNN