'The ball is in their court': U.S. responds to Russia's demands

Blinken said the document, handed over in person by U.S. ambassador to Moscow John Sullivan, addressed Russia's concerns and raised those of the United States and its allies.

He told reporters the response sets out a serious diplomatic path forward, should Russia choose it, and has a principled and pragmatic evaluation of Moscow's concerns.

He added that the United States was open to dialog.

"Putting things in writing is ... a good way to make sure we're as precise as possible, and the Russians understand our positions, our ideas, as clearly as possible. Right now, the document is with them and the ball is in their court," he said.

Washington has made clear that Russian demands for NATO to pull back troops and weapons from eastern Europe and bar Ukraine from ever joining are non-starters, but says it is ready to discuss other topics such as arms control and confidence-building measures.

Whether President Vladimir Putin is prepared to accept that limited agenda will determine the next phase of the crisis, in which Moscow has massed around 100,000 troops near the border with Ukraine while denying it plans to invade.

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