There have been rumors that the US and Russia would be teaming up to build a lunar base. Sources within the country told Popular Mechanics that the head of their space organization, Roscosmos, was set to announce a partnership agreement with NASA this week. Now, Roscosmos and NASA have both released statements saying stating the two countries' shared "common vision for human exploration."
They go on to say that Russia and the US will cooperate on a Moon program, specifically mentioning the Deep Space Gateway by name. That's the base NASA plans to build in lunar orbit starting in the 2020s (the statement sets a mid-2020s goal for beginning the project). The release also mentions that other international partners are considering signing onto the lunar base.
Roscosmos' statement also outlines a rough plan to create a set of international technical standards for the lunar space station and beyond. Specifically, both docking ports and life support systems will be based on Russian design; after all, they have a lot more experience running a space station and the current life support systems aboard the ISS are in the Russian section, Zvezda.