The US State Department said the sanctions were in response to "the use of a "Novichok" nerve agent in an attempt to assassinate United Kingdom citizen Sergei Skripal" - a former Russian double agent - and his daughter Yulia.
Poisoned: Russian ex-spy Sergei Skripal, 66, and his daughter Yulia Skripal, 33. Authorities determined that they had been attacked with a military-grade Russian nerve agent known as Novichok.
Washington said on Wednesday it would impose fresh sanctions on Russia by the end of August after it determined that Moscow had used a nerve agent against a former Russian agent and his daughter in Britain.
The U.S. made a similar determination in February when it found that North Korea used a chemical weapon to assassinate North Korean leader Kim Jong Un's half brother at the airport in Kuala Lumpur, Malaysia, in 2017.
Vladimir Putin's government violated an worldwide act banning the use of chemical and biological weapons with the assassination attempt, the State Department said.
New planet with strong aurora discovered 20 light years from Earth
She continued: "We think these mechanisms can work not only in brown dwarfs , but also in both gas giant and terrestrial planets". This finding could help to better understand the magnetic processes of stars and planets, Kao believes.
She said sanctions would take effect on or around 22 August, after a 15-day Congressional notification period. Waivers have been issued for foreign assistance and space flight activities, while commercial passenger aviation and other commercial goods for civilian use will be assessed on a case-by-case basis, according to the official who briefed reporters.
The move could cut off hundreds of millions of dollars worth of exports to Russian Federation, said the official, who requested anonymity in order to speak about the sanctions.
A blazing diplomatic row ensued between London and Moscow in the following weeks and months after the Scotland Yard-led investigation attributed blame to Russian Federation.
Two more people, Charlie Rowley and Dawn Sturgess, later came into contact with the lethal substance and were hospitalised.
Ahead of the announcement in Washington, the ruble took a hit and stocks fell in Moscow over rumours of new United States sanctions, which appeared to refer to the possible second round.