When they attack, defend for now and begin to push back - the effects of the Great Purge should still be in play; declare on Iran to get them to join the ComIntern - while you won't fight them, the British (who will guarantee you on historical, and get drawn into your war with ...
HOI4 ULTRA is a project which aims to implement historical industry into Heart of Iron. It implements major industrial balance changes, including a historial repatriation of industry using secondary sources such as The Wages of Destruction from Adam Tooze and The Rise and Fall of the Great Powers...