Well, they are a problem for Russia to access, because Siberia is both rugged and remote, so any development of those resources is going to have a significant up front dollar investment before there is any returns to speak of. There will undoubtedly be international competition for the rights to secure those resources should Russia call for foreign investment.
It is also a problem because Siberia is largely forested and relatively pristine, meaning it is one of the world's ecofriendly carbon dioxide scrubbing zones. Development of resources almost always spoils the environment, and in Russia that is particularly true. There are rare species of animals in that region that may be threatened.