Are you by any chance in the Crimean part of Ukraine or close to it?
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Comprehensively Embargoed Countries:
Crimea Region of Ukraine, Cuba, Iran, North Korea, Sudan, Syria
is that new or was it always in the Tos ??
I had some troubles in the past with poloniex due the same rule , so after they blocked Syiran IPs from even seeing poloniex charts I contacted bittrex and asked them if they are fine with Syrian traders
here is a screenshot at my very first day at bittrex, cause I wanted to make sure that things won't go wrong again
https://prnt.sc/h0wocq