It's perfectly normal to rent for the first few years after moving. Not many Americans can buy the house right now given the mortgage rates nowadays. There's always likely going to be some sacrifices for a new immigrant, but in the end, you may achieve your financial goals quicker in the States, considering the pay overall is higher than Eastern Europe. There's also a risk of relations between Russia and US deteriorating even more in the upcoming years, and nobody knows how it would complicate immigration. If the finances is the only concern, I'd reevaluate and see how to optimize costs and make it happen.
You should be able to stop the process and re-apply for visa in the future. But as mentioned in previous posts, better to pause it.