AWS CodePipeline can use external source providers in Europe (Milan) and AWS GovCloud (US-East)

You can now use source repositories from GitHub.com, GitHub Enterprise Server, Bitbucket Cloud, and GitLab.com with AWS CodePipeline in Europe (Milan) and the AWS GovCloud (US-East) Regions, to build, test, and deploy code changes. Connect your source provider account using AWS CodeStar Connections, and use the connection in your pipeline to automatically start a pipeline execution on changes in your repository. 

Source:: Amazon AWS