On Monday, the US national security adviser. UU., John Bolton, will face some difficult questions from Moscow, after Donald Trump said he will withdraw from a historic nuclear weapons treaty.
Trump's decision has faced strong criticism from former Soviet President Mikhail Gorbachev, who signed the treaty in 1987 with US President Ronald Reagan, who said the US administration does not know what he is doing.
The United States and Russia have exchanged accusations and denials in the past that the other is already violating the treaty.
The reports of Al Jazeera Step Vaessen from Moscow.