The content originally appeared on: CNN New York (CNN Business)US banks have left Russia, but that doesn't mean they're done making money off the Kremlin's horrific invasion of Ukraine. The sell-off of Russian debt associated with Russian President Vladimir Putin's campaign on Ukraine and the sanctions thatensued have created a window for a new type of arbitrage that some in the finance world are gobbling up, seeing it as easy money. The idea is what's known as a negative-basis trade, […]