Create an Amazon Aurora MySQL replica of the RDS for MySQL DB instance, pause application writes to the RDS DB instance, promote the Aurora Replica to a standalone DB cluster, reconfigure the application to use the Aurora database and resume writes, add eu-west-1 as a secondary Region to the DB cluster, enable write forwarding on the DB cluster, deploy the application in eu-west-1, and configure the application to use the Aurora MySQL endpoint in eu-west-1.

Add a cross-Region replica in eu-west-1 for the RDS for MySQL DB instance, configure the replica to replicate write queries back to the primary DB instance, deploy the application in eu-west-1, and configure the application to use the RDS for MySQL endpoint in eu-west-1.

Copy the most recent snapshot from the RDS for MySQL DB instance to eu-west-1, create a new RDS for MySQL DB instance in eu-west-1 from the snapshot, configure MySQL logical replication from us-east-1 to eu-west-1, enable write forwarding on the DB cluster, deploy the application in eu-west-1, and configure the application to use the RDS for MySQL endpoint in eu-west-1.

Convert the RDS for MySQL DB instance to an Amazon Aurora MySQL DB cluster, add eu-west-1 as a secondary Region to the DB cluster, enable write forwarding on the DB cluster, deploy the application in eu-west-1, and configure the application to use the Aurora MySQL endpoint in eu-west-1.