How do I handle multiple environments in AWS?

Question

I prepared all my staging environment in aws and now I'm trying to setup production. I found that it's better to have 2 accounts in different availability zones as it's explained in this question: aws in production and development environments

So my staging account is in eu-central-1 and I want to setup production in eu-west-1.

I met different difficulties.

First of all I don't think that it's good idea to have 2 source controls. So I left all the sources in codecommit in eu-central-1. Code build also produces only one container which is in eu-central-1 as well. I made a new s3 bucket in eu-west-1 with file containing production environment variables and another file containing git secrets. I updated fargate execution role to have access to the new resources. Still when I tried to run the new fargate service which resides in eu-west-1 I receive the following error:

ResourceInitializationError: unable to pull secrets or registry auth: execution resource retrieval failed: unable to retrieve ecr registry auth: service call has been retried 3 time(s): RequestError: send request failed caused by: Post https://api.ecr.eu-central-1.amazonaws.com/: i/o timeout

I see I can't pull image from eu-central-1. I might miss something small but my problems is that I might doing everything totally wrong. Any advice will be much appreciated.