The former Russian president wrote on Telegram how there would be dire global consequences to the sanctions imposed on Russia.
The U.S. has warned its partners against purchasing Russian military equipment if they wish to avoid sanctions under a 2017 law.
New sanctions take aim at Chinese and Russian firms doing business with Iran, with more penalties possible.
The country is suffering from such severe hyperinflation that residents are buying basic goods with duffel bags full of cash.
Russian plans to create its own regulated version of bitcoin.
The African country's ties to Pyongyang could be holding up the removal of sanctions after 20 years.
Lawmakers will impose stiffer punishments on foreign companies doing business with Pyongyang.
The emergency move aims to halt a collapse in the ruble as oil prices decline and the country's sanctions-hit economy slides towards recession.
Russia's gross domestic product will probably fall by 0.8 percent next year, hit by low oil prices and sanctions.