"The US government will not attend [the forum] at any level," the official said.
The State Department pointed out it has warned US companies about "clear risks — both economic and reputational — associated with top-level engagement with a government that is flouting the most fundamental principles of international rule of law by intervening militarily in a neighboring country."
On Tuesday, Russian Deputy Prime Minister Sergei Prikhodko said more than 1,500 business people from 62 countries, including the heads of 190 large foreign companies, are expected to participate in SPIEF on June 16-18.
The official also noted that the US authorities will not consider "business as usual" with Russia until Moscow fully implements the Minsk agreement to settle the conflict in eastern Ukraine.
In 2014, the United States and some of their allies imposed a series of economic sanctions targeting key Russian sectors as well as a number of individuals and entities over Crimea’s reunification with Russia and its alleged interference in the conflict between Kiev and independence supporters in eastern Ukraine.
Moscow has repeatedly refuted the allegations, warning the Western sanctions are counterproductive and noting that Crimea’s rejoining Russia came after a popular referendum in which the vast majority of citizens democratically decided in favor of reunification.