"Since the seizure of these compounds, we are unaware of any evidence or assessment that the treatment of US personnel in the Russian Federation has markedly improved."
The letter was signed by Senate Minority Leader Chuck Schumer and his colleagues Ben Cardin, Chris Van Hollen, and Kirsten Gillibrand.
In December 2016, President Barack Obama introduced a sanctions package that contains a measure barring access to two diplomatic compounds in use by the Russian Embassy in Washington and Russia’s Permanent Mission to the United Nations in New York.
Russian Deputy Foreign Minister Sergey Ryabkov told Sputnik on Thursday that his meeting with Shannon next week may still happen despite the countries continuing to hold different positions on a number of issues.