The US dollar has traded above 80 rubles for the first time since early April, marking a renewed weakening of the Russian currency in morning trading.
According to ICE data, the dollar reached 80.375 rubles at 11:57 a.m.
5% for the month, has put pressure on emerging market currencies, including the ruble.
Moscow time, representing a 3.98% increase in the session.
The move pushes the pair well above the Bank of Russia's official closing rate of 77.7539 rubles set for June 30.
The slide in the ruble comes as the US dollar closes June with its largest monthly gain in nearly a year.
The broad-based strength of the greenback, which is on track to advance 2.5% for the month, has put pressure on emerging market currencies, including the ruble.