That means prisoner or captive. You know, as in “Germany is a captive of Russia.”
Yeah. A captive who finally got caught.
“It pays billions and billions of dollars to Russia for energy. Germany is a rich country. Why should the U.S. protect you against Russia when the two countries are making deals? You tell me, is that appropriate?”
Deutschland ist ein Gefangener Russlands.
Observing Hermann 
The Merkel people are saying that the!y cannot buy U.S. natural gas because it is expensive. Go figure!