Russian State TV Wants Moscow to Conquer Three US States

Well, it did in the American Revolutionary War. But there hasn't been much by way of countries seriously looking into invading the US over the centuries.

We do have one instance, though.

In World War I, Germany tried to get Mexico to invade the US, and offered to provide support in annexing part of the US.

Mexico's leadership had the military examine the proposal. They advised against it. One of the cited rationales for not invading was the widespread gun ownership in the US.

https://en.wikipedia.org/wiki/Zimmermann_Telegram

Mexican President Venustiano Carranza assigned a military commission to assess the feasibility of the Mexican takeover of their former territories contemplated by Germany. The generals concluded that such a war was unwinnable for the following reasons:

• Mexico was in the midst of a civil war, and Carranza's position was far from secure. (Carranza himself was later assassinated in 1920.) Picking a fight with the United States would have prompted the U.S. to support one of his rivals.

• The United States was far stronger militarily than Mexico was. Even if Mexico's military forces had been completely united and loyal to a single government, no serious scenario existed under which it could have invaded and won a war against the United States. Indeed, much of Mexico's military hardware of 1917 reflected only modest upgrades since the Mexican-American War 70 years before, which the U.S. had won.

• The German government's promises of "generous financial support" were very unreliable. It had already informed Carranza in June 1916 that it could not provide the necessary gold needed to stock a completely independent Mexican national bank. Even if Mexico received financial support, it would still need to purchase arms, ammunition, and other needed war supplies from the ABC nations (Argentina, Brazil, and Chile), which would strain relations with them, as explained below.

• Even if by some chance Mexico had the military means to win a conflict against the United States and to reclaim the territories in question, it would have had severe difficulty conquering and pacifying a large English-speaking population which had long enjoyed self-government and was better supplied with arms than were most other civilian populations.

• Other foreign relations were at stake. The ABC nations had organized the Niagara Falls peace conference in 1914 to avoid a full-scale war between the United States and Mexico over the United States occupation of Veracruz. Mexico entering a war against the United States would strain relations with those nations.

But, again, I think that all this misses the point. There isn't going to be land warfare, much less militia warfare, against Russian land forces. Russia doesn't have the means to transport forces from Russia to the US. The US has a considerably larger air force and navy, and an invasion fleet is going to run into that in the Pacific before it gets to California.