The "Open Door Policy" was a concept proposed by the United States in the late 19th and early 20th centuries, aimed at ensuring equal trading opportunities in China for all countries involved. Among the options provided, Russia was NOT one of the countries invited to participate in the "Open Door Policy."
Here's why:
1. Russia was not initially included in the countries that were specifically invited to participate in the Open Door Policy negotiations.
2. The main countries involved in the Open Door Policy negotiations were the United States, Britain, Germany, France, Italy, Japan, and Russia was not part of this group.
Therefore, in the context of the question, Russia was the country that was NOT invited to participate in the "Open Door Policy."
