U.S. President Donald Trump pulled out of the pact last year, arguing that Russian violations made it untenable for Washington to remain a party. Washington completed its withdrawal from the treaty in November.
Moscow has deplored the U.S. withdrawal, warning that it will erode global security by making it more difficult for governments to interpret the intentions of other nations, particularly amid heightened Russia-West tensions.
The European Union has urged the U.S. to reconsider its exit and called on Russia to stay in the pact and lift flight restrictions, notably over its westernmost Kaliningrad region, which lies between NATO allies Lithuania and Poland.
Russia has insisted the restrictions on observation flights it imposed in the past were permissible under the treaty and noted that the U.S. imposed more sweeping restrictions on observation flights over Alaska.
As a condition for staying in the pact after the U.S. pullout, Moscow has unsuccessfully pushed for guarantees from NATO allies that they wouldn’t hand over the data collected during their observation flights over Russia to the U.S.
The upper house of Russia’s parliament, the Federation Council, is expected to approve the withdrawal bill on June 2; once Putin signs the measure, it would take six months for the Russian exit to take effect.