The former Russian double agent and his daughter were found unconscious on a bench in the town of Salisbury, England, on March 4.
Russian Federation was drawing up retaliatory sanctions against the United States yesterday amid soaring tensions over Washington's announcement that Moscow would be punished for a nerve agent attack on British soil.
The announcement of U.S. sanctions caused the value of the rouble to plunge early on Thursday and Russian stock markets to fall.
Nerve agent attack: What is Novichok? Mr Skripal and his daughter recovered after intensive care in hospital, and their current whereabouts are being kept secret.
The spokesperson went on to say Russian American relations are at a record low point and the US continues to deteriorate bilateral ties.
Foreign Ministry spokeswoman Maria Zakharova said Moscow had not yet received any official USA request to open up sites once linked to chemical weapons for inspection.
According to the US Department of State, the US authorities are going to decide on unveiling the second package of sanctions against Moscow in 90 days' time depending on whether it fulfills a number of conditions.
They were aimed at punishing Putin's government for having "used chemical or biological weapons in violation of worldwide law", spokeswoman Heather Nauert said in a statement.
The Kremlin acknowledged on Thursday Putin's office had received the letter, but Peskov suggested the Russian leader was yet to parse it.
The new sanctions will not fully take effect until later in August, but already the Russian ruble tumbled to two-year lows and nervous investors began selling off Russian assets. These are sensitive goods that normally would go through a case-by-case review before they are exported. There will also be some further restrictions on Russian access to U.S. financial services.
The State Department's surprise announcement of the new sanctions on Wednesday jolted Moscow, where some politicians and analysts had been hopeful that Putin's meeting with President Trump in Helsinki in July would stabilize U.S. Washington, those outlets say, wants to block Russia's return as a world power and is willing to harm the Russian people to that end.
Although the U.S. joined European countries in publicly blaming Moscow within days of the attack, the Trump administration never issued a formal triggering of sanctions under its decades-old United States law on chemical weapons.
"The mandatory sanctions that follow this determination are key to increasing pressure on Russian Federation".
But he has faced criticism from US lawmakers for not taking a stronger position against reported Russian interference in the 2016 USA elections.
All are prohibited from any transactions involving the United States financial system.
"Once again we deny in the strongest terms the accusations about the possible connection of the Russian state to what happened in Salisbury". Those sanctions restrict travel and financial transactions.
Kremlin spokesman Dmitry Peskov, speaking to reporters on a conference call, said the U.S. move was "absolutely unfriendly", but said Moscow continued to hope that for an improvement in battered U.S. -Russia relations. Since the chances of this determination being made are nearly a certainty, the next round of sanctions is coming in three months.
What was the nerve agent?
After taking a hit in what BCS brokerage described as panic reaction, the rouble managed to move away from two-year lows. Washington ordered 60 diplomats to leave and closed the Russian consulate-general in Seattle. Two others later became ill, officials believe, from coming into contact with the same poison.