Russian Prime Minister Dmitry Medvedev has signed a decree to suspend atomic research and development work with the United States, his website said Wednesday.
"US sanctions against Russia, including a (previous) suspension of US-Russian collaboration in the field of atomic energy, demand countermeasures," a statement on Medvedev's website said, explaining the decree.
Russian state media reported that the current suspension specifically pertains to work between the Russian government's atomic energy corporation, Rosatom, and the US Department of Energy.
Earlier this week, Russian President Vladimir Putin signed a decree to suspend a US-Russian agreement on disposing of excess weapons-grade plutonium. Meanwhile, the US government announced that it was suspending military cooperation with Russia in the Syrian conflict.