Russia sent an official diplomatic note to the United States this week, warning the US government of the "unpredictable consequences" of a significant increase in Washington's military aid to Ukraine, US media reported.

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In a note, Moscow warned the United States and NATO not to send "more sensitive" weapons to Ukraine, noting that the supply of such military equipment "adds fuel to the fire" and could have "unpredictable consequences," the Washington Post reported. .

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The warning came after US President Joe Biden promised new $ 800 million in military aid to Ukraine, including helicopters and armored personnel carriers.

"What the Russians are telling us tacitly is exactly what we are saying to the world in public - that the impressive help we are providing to our Ukrainian partners is proving its remarkable effectiveness," a senior US official was quoted as saying.

The State Department declined to comment, AFP reported.

According to the New York Times, the note was sent through the usual diplomatic channels and was not signed by a senior Russian official.

Citing a source familiar with the matter, CNN noted that the diplomatic note could mean that Moscow is preparing to take a more aggressive approach to the United States and NATO.

On Wednesday, Joe Biden gave the green light to send significant military aid to Ukraine, containing heavier weapons than have been delivered so far.

The new US supplies will include some of the "highly efficient weapons we have already delivered" to Ukraine, as well as "new capabilities", including "artillery systems and armored personnel carriers", the US government said.

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