The article does not say that aliens caused Russia to be cold long ago. It says that the USA may have caused Russia to be getting warm in recent years. They're reasonably terrified of the permafrost melting. We here in the USA drive our cars like nothing is happening, and would probably respond to news of the permafrost melting with something along the lines of "you're welcome, Russia".
I wonder if aliens are behind the desertification of the middle-East and the Sahara?