Russia is the most active foreign adversary trying to influence the Nov. 5 U.S. presidential election, while China is more focused on influencing down-ballot races, a senior U.S. intelligence official said on Friday.

Restrictions on chip sales and services have already been in the works with the US leveraging authority in hopes of influencing Japan to limit their exports. China threatened retaliation to this, as both the US and China look to dominate in what seems to be evolving into a battle of attrition between the two superpowers.