If ETFs were living creatures, they might be cockroaches—they can survive almost anything. And yet Russia's invasion of Ukraine has presented a rare test. The VanEck Russia ETF, or $RSX, has seen its trading halted; the product holds shares of Russian companies, many of them in the energy and financial sectors. Investors may end up recovering only a fraction of their exposures; retail traders who used options to short the ETF ahead of its mid-February nosedive may not be able to collect their winnings, either. Elsewhere in the world, the exchange-traded product $VXX went haywire recently, with Barclays temporarily suspending share issuance. What's happening here?On this episode of Trillions, Eric and Joel discuss these recent events with Dave Nadig of ETF Trends, and Katie Greifeld, ETF reporter with Bloomberg News and the co-host of ETF IQ on Bloomberg TV. They go over the unprecedented nature of RSX's circumstances and what it all means, and they explore why the best days of exchange-traded notes might be behind them. Eric also adds audio from his native habitat: the Philadelphia train station.See omnystudio.com/listener for privacy information.