In July, North Korea successfully launched the country's first intercontinental ballistic missile (ICBM), which had the capability of reaching the U.S territory.
Kim is reportedly a key figure in the North's ballistic missile development, involved in efforts to switch from liquid to solid fuel, while Ri is a lead official in the country's development of intercontinental ballistic missiles, the Treasury said.
The new measures order North Koreans working overseas to return home within two years, and ban almost 90 per cent of refined petroleum exports to the country.
Dangerously cold weather in the forecast for south central Montana
The weather service warned the coldest conditions will be Monday night into Tuesday morning and Tuesday night into Wednesday. Saturday night, look for patchy blowing snow under mostly cloudy skies that will gradually become clear.
The United States has sanctioned two North Korean officials known for their role behind North Korean leader Kim Jong Un's missile program, according to a notice posted to the U.S. Treasury Department's website Tuesday.
Both men are regularly photographed alongside North Korean leader Kim Jong-un at missile launches. Any of their property within US jurisdiction is blocked and American citizens are generally banned from engaging in transactions with them. North Korea has described the sanctions as an act of war.
The Treasurer also said that the two officials were listed in a new United Nations Security Council resolution sanctioning North Korea last Friday.
Jennifer Lawrence just gave Kris Jenner the best Christmas surprise ever!
On Saturday, Kris posted an Instagram snap of the white convertible Porsche that Jennifer gifted her for Christmas . Jenner was asked to deliver a birthday cake to the actor on her birthday, which she did, and the rest is history.
Ri is deputy director of the Workers' Party Munitions Industry Department, which oversees the ballistic missile program, which was sanctioned by the State Department in 2010. North Korean citizens working in other countries will also have to return in the next 24 months, preventing the country from obtaining foreign currency.
They were both among 16 North Koreans placed under United Nations sanctions on Friday.
In response, North Korea's official official KCNA news agency said: "The United States, completely terrified at our accomplishment of the great historic cause of completing the state nuclear force, is getting more and more frenzied in the moves to impose the harshest-ever sanctions and pressure on our country".
Snow arrives in Kitsap County for Christmas
Arctic air will sweep into the area in the wake of the snow bringing the city it coldest weather since last December. Highs on Christmas Day are forecast around 20 degrees and the overnight low could bottom out around zero, he said.
It also bans imports of North Korean food, agricultural products, minerals, machinery and electrical equipment to deprive the regime of at least US$200 million in annual export revenues.