Ukraine Crisis: Blinken: No concessions in response to Russia on Ukraine

US Ambassador to Russia John Sullivan enters the Russian Foreign Ministry building in Moscow. Photo / AP

The US has made no concessions to the main Russian demands over Ukraine and Nato in a long-awaited written response delivered to Russia on Wednesday in Moscow, Secretary of State Antony Blinken said.

Russian frigate Admiral Essen prepares to sail for an exercise in the Black Sea. Photo / AP

Blinken said the US response, delivered to the Russian Foreign Ministry by US Ambassador to Russia John Sullivan, gave up no ground on "core principles" such as Nato's open-door membership policy and the alliance's military presence in Eastern Europe.

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Blinken said the document made clear that the US is standing by its oft-stated positions. "There is no change, there will be no change," he said. But, he said the written response to Russia also contains "serious" offers for a diplomatic path to de-escalate soaring tensions over Ukraine by addressing Russian concerns on other matters.

Russian mortar fire during a military exercise. Photo / AP

Russia has warned it would quickly take "retaliatory measures" if the US and its allies rejected its demands.

Blinken said he expects to speak again with Russian Foreign Minister Sergey Lavrov in the coming days to get the Russian reaction. But, he said that whether Russia accepts them is entirely the decision of President Vladimir Putin. "That is up to President Putin," he said. "We'll see how they respond."

The US proposals, echoed in a separate document sent to the Russians by Nato, include the potential for negotiations over offensive missile placements and military exercises in Eastern Europe as well as broad arms control agreements as long as Russia withdraws its estimated 100,000 troops from the Ukrainian border.

Russian missile cruiser Marshal Ustinov during exercises in the Arctic. Photo / AP

Moscow has demanded guarantees that Nato will never admit Ukraine and other ex-Soviet nations as members and that the alliance will roll back troop deployments in former Soviet bloc nations. Some of these, like the membership pledge, are nonstarters for the US and its allies, creating a seemingly intractable stalemate that many fear can only end in a war.

The Kremlin has repeatedly denied it has plans to attack Ukraine, but the US and Nato are worried about Russia massing its troops near Ukraine and conducting a series of sweeping military manoeuvres.

As part of the drills, motorised infantry and artillery units in southwestern Russia practised firing live ammunition, warplanes in Kaliningrad on the Baltic Sea performed bombing runs, dozens of warships sailed for training exercises in the Black Sea and the Arctic, and Russian fighter jets and paratroopers arrived in Belarus for joint war games.

Russian Foreign Minister Sergey Lavrov addresses the State Duma. Photo / AP

Speaking to Russian lawmakers, Lavrov said he and other top officials will advise Putin on the next steps after receiving the US reply.

"If the West continues its aggressive course, Moscow will take the necessary retaliatory measures," Lavrov said.

But he indicated Russia wouldn't wait forever. "We won't allow our proposals to be drowned in endless discussions," he said.

Secretary of State Antony Blinken. Photo / AP