Included free with the base game — no Steam store pageIt had already been free in the base game for years by the time No Compromise, No Surrender came along to expand it further — but this DLC laid the groundwork, the first to give China a focus tree worth playing.
What New Content It Added
It didn't bring system mechanics of its own — all the weight is in the nation content, laying part of the groundwork Götterdämmerung and No Compromise, No Surrender would later build on.
Nations: China, and Its Neighbors Too
Nationalist China and 
Communist China got their first genuinely playable trees here. 
Germany and 
Japan received tweaks and additions to what they already had. It also multiplied the narrative content and events for the Pacific theater, which had barely any presence until then. If you've ever wondered why China has so much depth for being "just" a country in permanent civil war, the answer starts here. Since it's integrated free, there's no purchase decision to make, just useful context before diving into the more recent Pacific-focused expansions.