The notice to Congress states that the sanctions will be extended for another year after they expire on March 6, 2018, referring to the sanctions imposed on Russia signed by former US President Barack Obama on March 6, 2014.
Trump mentioned in his order that Russias actions and policies in Ukraine continue to pose a great threat to U.S. national security and foreign policy.
Russias relations with the West have deteriorated due to the situation in Ukraine and Crimea. The West accused Russia of interfering and imposing sanctions on Russia. Russia has repeatedly stressed that Russia is neither a participant in the Ukrainian conflict nor a subject of the Minsk Mediation Agreement. Moscow implemented the response measures on August 6, 2014, adopted the import substitution policy, and repeatedly expressed that dialogue with Russia in the language of sanctions had the opposite effect. Recently, there have been more and more calls from the West for lifting sanctions against Russia.
Source: Qian Mingxiao_NBJ10675, Responsible Editor of CNN