FTX estate is suing Binance and its former CEO, Changpeng Zhao, to recover $1.8 billion fraudulently transferred.The lawsuit claims that Binance's sale of its FTX stake was funded by insolvent Alameda Research.FTX seeks to recover the funds and additional compensatory and punitive damages.The lawsuit highlights the tense relationship between FTX and Binance, two major crypto exchanges.