Should our children learn Russian or Spanish?

Okay, here's some background info before I get to the question. I was born and raised in Russia. I moved to the U.S. when I was 14. I am fluent in Russian and English. My boyfriend was born and raised in the U.S. He only speaks English.

I told my bf that if we get married and have kids, I want our children to study Russian as a second language. I want their native language to be English, but I want them to be able to speak Russian as well, since most of my relatives live in Russia and do not speak English. My mom lives in the states, but her English isn't very good. I can teach the language to the kids and they can practice it with me and my mom.

My boyfriend argues that it would be a waste of time for our children to learn Russian because "no one" in the U.S. speaks Russian. He insists that our children learn Spanish instead. Well, neither my bf nor I can speak Spanish. I mean, we know a few words and phrases, but we can't really speak it. Neither of us has any relatives or friends who speak Spanish. We'd have to hire someone to teach our kids Spanish. Which is fine, but ... who are our kids going to practice Spanish with so they don't forget what they learn?

I suggested to my bf that we have our kids learn both: Russian and Spanish, but my bf is still against our kids learning Russian. What do you think? Would it really be a waste for our children to learn Russian? Do you really think that Spanish would be much more useful for them?