Russia's Foreign Minister Sergei Lavrov said on Sunday that U.S. President Donald Trump had sent a short letter about the Intermediate-Range Nuclear Forces (INF) Treaty to Russian President Vladimir Putin, the Interfax news agency reported.

"U.S. President Donald Trump sent a short letter in which he said that they are ready to continue looking for ways to overcome the problems in our relations," Interfax cited the minister as saying on a TV talk show.

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The letter was in response to Putin's offer to introduce a moratorium on the development of missiles banned under the INF Treaty, Interfax cited Lavrov as saying.

The INF Treaty, signed between Washington and Moscow in 1987, banned the production, testing and stockpiling of land-based cruise and ballistic missiles with ranges of 500 to 5,500 kilometers, along with their launchers. It was once regarded as the most successful arms control agreement reached during the Cold War.

The U.S. formally left the INF Treaty with Russia in August after determining that Moscow was violating the treaty and had already deployed one banned type of missile, an accusation Kremlin denies.

The last remaining nuclear arms reduction agreement between the U.S. and Russia is the 2010 New Strategic Arms Reduction (New START), which will expire in February 2021. Putin has said Russia is willing to extend New START "without any preconditions" but U.S.' attitude is still unclear.

(With input from Reuters)