Russia-U.S. relations are in a state of “unprecedented crisis” without any sign of improvement, a senior Russian diplomat said Thursday.

Deputy Foreign Minister Sergei Ryabkov argued that the White House’s emphasis on increasing weapons supplies to Ukraine to ensure Russia’s defeat leaves no room for diplomacy, according to AP.

“I don’t see any prospect for a productive political and diplomatic process,” Ryabkov said at a briefing. “We have a very deep and unprecedented crisis in Russia-U.S. relations. The Biden administration has driven them into a deadlock.”

Ryabkov warned that the U.S. and its allies must carefully assess the risks stemming from supplying increasingly powerful Western weapons to Ukraine.

“The Americans need to thoroughly and deeply weigh the risks linked to their unabashedly cavalier course,” he said.

Ryabkov noted that Moscow doesn’t trust Western statements about self-imposed restrictions on a range of weapons supplied to Ukraine in order to avoid escalation, adding that such assurances in the past have served as cover for a steady expansion of the assortment of arms deliveries.

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