Against the euro, the rouble weakened 1.2 percent to 78.77, a level last seen on April 11 amid a previous round of market volatility driven by USA sanctions.
"The sanctions theme remains in focus for Russian market players", said Rosbank, a subsidiary of Societe Generale.
The latest drop in the value of the Russian currency came amid talk that the USA was readying further sanctions.
As Russia buys gold, it continues to sell US Treasurys.
While legislators have been very active in sponsoring more anti-Russia sanction bills, the White House has been warier in its approach, with President Trump drawing personal criticism for his softer stance on all Russia-related issues.
"Russia is the optimal supplier to the European economy". "We will not hesitate to do so if its conduct does not demonstrably and significantly change".
"And everyone understands this very well", Ryabkov said in comments reported by Interfax news agency.
Russian President Vladimir Putin has called USA sanctions against Moscow "counterproductive and senseless" after Washington warned that more "economic pain" was to come.
Ryabkov said Russian Federation will seek ways to avoid using the USA dollar in payments.
Ryabkov also said that Moscow would not halt exports of titanium to the United States for its aviation industry as part of any response to sanctions, RIA reported.