Russia cannot yet accept US proposals to end the war in Ukraine because they fail to address issues Moscow believes caused the conflict, a senior Russian diplomat says.

The comments by Deputy Foreign Minister Sergei Ryabkov suggest Moscow and Washington have so far been unable to bridge differences that President Vladimir Putin raised more than two weeks ago when he said US proposals needed reworking.

They come as US President Donald Trump appears to be growing increasingly impatient with what he has suggested might be foot-dragging over a wider deal by Moscow.

Trump in recent days has said he is “pissed off” with Putin and has spoken of imposing sanctions on countries that buy Russian oil if he feels Moscow is blocking a deal.

Ryabkov, a specialist in US-Russia relations, said Moscow was not yet able to move forward with a deal.

“We take the models and solutions proposed by the Americans very seriously, but we can’t accept it all in its current form,” Ryabkov was quoted by state media as telling the Russian magazine International Affairs in an interview released on Tuesday (local time).

“As far as we can see, there is no place in them today for our main demand, namely to solve the problems related to the root causes of this conflict. It is completely absent, and that must be overcome.”

Putin has said he wants Ukraine to drop its ambitions to join NATO, Russia to control the entirety of four Ukrainian regions it has claimed as its own, and the size of the Ukrainian army to be limited. Kyiv says those demands are tantamount to demanding its capitulation.

Asked about Trump’s latest remarks about wanting Putin to do a deal on Ukraine, Kremlin spokesman Dmitry Peskov said earlier on Tuesday that Moscow was “continuing our contacts with the American side”.

“The subject is very complex. The substance that we are discussing, related to the Ukrainian settlement, is very complex. This requires a lot of extra effort,” he said.

Russia also said on Tuesday it was fully complying with a US-brokered moratorium on attacking Ukraine’s energy facilities.

Russian Foreign Minister Sergei Lavrov told state TV that Defence Minister Andrei Belousov had briefed Putin on alleged Ukrainian violations during a meeting of Russia’s Security Council on Tuesday. Russia passed a list of the violations to US National Security Adviser Mike Waltz and Secretary of State Marco Rubio, Lavrov said.

Until last weekend, Trump had taken a more conciliatory stance towards Russia that had unnerved the US’s European allies as he tried to broker an end to the conflict in Ukraine, now in its fourth year.

But in recent days, and amid lobbying by Europeans such as Finland’s president urging him to hold Russia to account, he has adopted a tougher tone.

Meanwhile, the Russian Defence Ministry on Tuesday said its forces had taken control of the village of Rozlyv in Ukraine’s eastern Donetsk region, the focal point of their steady westward advance through the area.

Ukraine’s military said Russian forces had launched five attacks on Rozlyv and the nearby village of Kostiantynopil. It made no acknowledgement that Rozlyv was in Russian hands.

A late evening report by the Ukrainian General Staff said three battles were still going on in the area.

-AAP