"The Chinese [intelligence] have a much bigger footprint upon which to execute that mission than the Russians do", Pompeo said. The head of Russia's military intelligence, the GRU, also came to Washington, though it's not clear that he met with Pompeo.
In his letter, Pompeo said the meetings with the Russians were not without discord.
Schumer wrote his own letter on Thursday to National Intelligence Director Dan Coats, calling on him to disclose what was discussed at the meetings and whether the Russians also met with Trump administration officials at the White House, State or Defense departments or the National Security Council.
Earlier in the week, Russian Ambassador to the United States Anatoly Antonov said the country's Foreign Intelligence Service Chief, Sergey Naryshkin, recently held talks with counterparts on U.S. soil, triggering a backlash from lawmakers.
In a letter to Schumer Thursday, Pompeo explained that he meets regularly with his Russian counterparts to discuss cooperation on terrorism, returning jihadi fighters and other threats.
China hit back on Thursday at CIA Director Mike Pompeo calling Beijing a "bigger threat to the US than Russian Federation". He has been on a U.S. Treasury Department list of sanctioned individuals "for involvement in the situation in Ukraine" since 2014, when he was chairman of the Duma.
In the interview, Pompeo also repeated his message that North Korea was close to developing missiles which could be used in a nuclear attack on the United States.
"If this administration is ignoring sanctions, that's very serious", he said.
Palestinian president to attend UN Security Council's meeting on Middle East
An outraged Abbas rejected the decision, saying the USA could no longer be an acceptable mediator in the peace process. Mark Tawadros II, Arab Parliament chief Meshaal bin Fahm al-Salmi and Palestinian President Mahmoud Abbas.
CAATSA - or the Countering America's Adversaries Through Sanctions Act - is a law signed by Trump in August that imposed sanctions on Russia, Iran, and North Korea.
News of Naryshkin's secret visit poured fresh fuel on the battles pitting the Trump administration and its Republican defenders against Democrats over investigations into Moscow's alleged 2016 election interference. In Moscow, the provenance of the list was roundly mocked, even as officials expressed irritation at the US action.
"While we do not discuss the schedules of USA intelligence leaders, rest assured that any interaction with foreign intelligence agencies would have been conducted in accordance with USA law and in consultation with appropriate departments and agencies", a CIA spokesman said.
"We can watch very focused efforts to steal American information, to infiltrate the United States with spies, with people who are going to work on behalf of the Chinese government against America", he said.
Central Intelligence Agency directors regularly meet and hold talks with their Russian counterparts on a variety of issues.
The Post noted that Moscow and the US have shared information on terrorism in the past, but the process is not usually so robust or close.
Asked if Russian Federation would try to influence the mid-term elections, he said: "Of course".
"There's just a fundamental difference piled on top of the fact that the two countries' intelligence agencies are basically at war", Weiss said.
"I haven't seen a significant decrease in their activity", Pompeo told the BBC.