By Yousef Saba, Lisa Barrington, Riham Alkousaa and Alexander Cornwell DUBAI (Reuters) – Crypto firms in the United Arab Emirates (UAE) are being deluged with requests to liquidate billions of dollars of virtual currency as Russians seek a safe haven for their fortunes, company executives and financial sources said. Some clients are using cryptocurrency to invest in real estate in the UAE, while others want to use firms there to turn their virtual money into hard currency and stash it elsewhere, the sources said One crypto firm has received lots of queries in the past 10 days from Swiss broker…