Yeah, Microsoft tried 'both ways' to expand their quite small Windows Phone applications catalogue. And while Project Astoria [1] aimed at bringing Android apps, Project Islandwood was about easing porting of iOS applications [2]. Then MS decided that Windows Phone platform has no future.

[1] - https://www.windowslatest.com/2016/02/26/project-astoria-por...

[2] - https://www.windowslatest.com/2016/02/09/project-islandwood-...

WSA was (or is, since still works unofficially) running Android in VM underneath.