How to geographically distribute a (My)SQL read-write database?

Question

MySQL

Situation: application (php+mysql db). Everything is located on one powerful server in the cloud (DC - USA).
Problem: European customers accessing the app has pings, which is bad for business.
I did a little research and realized that master-slave replication is not suitable for us, because. each client can constantly perform write operations and immediately read.
Master-master replication looks unreliable and requires expert supervision.
What solution can be seen (based on other sql databases)? Especially something that supports geo-sharing out of the box.
Share your experience!

Answer 1

So far, Galera Cluster looks like the most suitable solution.