If you backed up your phone to iTunes on your computer, you can reload it on your phone.
I contacted Apple Support in the US last night. They suggested that we contact Yuneec to get it reinstated on the App Store. According to them Apple did not remove the app and it has everything to do with Yuneec and the government of the country/region that your App Store resides in.
It is a shame to have equipment become unusable simply because we do not have access to the software that controls it.