AlloyDB’s cross-region replication feature, according to the company, will allow enterprises to create secondary clusters and instances from a primary cluster to make the resources available in different regions.

Source: https://www.infoworld.com/article/3688950/google-makes-alloydb-for-postgresql-available-in-16-new-regions.html

This can be solved by data replications across clouds and regions or by using modern cloud-native databases such as CockroachDB, Yugabyte, TiDB and MongoDB, which can easily handle cross-region data replications and queries.

Source: https://venturebeat.com/data-infrastructure/why-agility-and-portability-have-become-key-drivers-of-multicloud-investments/