Russia must prepare for a long confrontation with the United States and has sent repeated warnings to Washington over the crisis in relations, Deputy Foreign Minister Sergei Ryabkov was quoted as saying on Tuesday, Paralel.Az reports citing Reuters.

Ryabkov, who oversees arms control and relations with Washington, said Moscow had no illusions about relations, given the "bipartisan anti-Russian consensus" in the United States.

"We must prepare for a long-term confrontation with this country. We are ready for this in every sense," Ryabkov was quoted as saying by state news agency RIA.

"We are sending all the warning signals to our opponent so that it does not underestimate our determination," Ryabkov said.