Captain Sim wrote on Feb 24^th, 2021 at 5:35pm:

The amount displayed in UAH (Ukrainian Hryvna) is just an internal banking calculation of the USD amount. You do not pay anything extra.

Captain Sim tech support,

As I predicted correctly, I got latest credit card bill containing last month statement of my normal personal purchases plus purchase of your Captain Sim 707 as well as 707C  and guess what?? The credit card bill did show one dollar charge for foreign exchange service for purchase of Captain Sim 707 and 707C.

Regards,

Aharon