Prime Minister Rishi Sunak has requested for an evaluation of the progress of the warfare in Ukraine, BBC Newsnight has learnt.
Senior figures concern the PM could also be taking an excessively cautious strategy because the warfare enters a key section.
One Whitehall supply likened the train to a "Goldman Sachs dashboard" examination of the warfare and the way UK army provides are used.
Downing Avenue insists that Mr Sunak is strongly supportive of Ukraine.
In a tweet, Mr Sunak stated the UK was with Ukraine "all the way in which" throughout a go to to the nation final month, his first abroad journey as prime minister.
A Downing Avenue supply added that it was not true that Sunak was being overly cautious and that "the UK authorities's help for Ukraine is unwavering".
However the request has raised alarm bells in some corners of Whitehall as army chiefs say weapons provides to Ukraine could show decisive within the winter months forward.
The Whitehall supply stated: "Wars aren't received [by dashboards]. Wars are received on intuition. Initially of this it was Boris (Johnson) sitting down and saying: 'Let's simply go for this.' So Rishi must channel his interior Boris on overseas coverage although not after all on the rest."
The supply stated the audit, generally known as a data-driven evaluation, is designed to evaluate the progress of the warfare and the importance of the UK's army contributions to Ukraine. The supply stated: "That is about what now we have put in, what now we have bought out."
The UK has been one of many greatest suppliers of army help to Ukraine since Russian President Vladimir Putin's forces invaded the nation in February.
BBC Newsnight has been advised that Volodymyr Zelensky, the president of Ukraine, is conscious of the controversy throughout the UK and is encouraging Mr Sunak to take care of robust army help for his nation.
"President Zelensky has sensed what’s going on," the supply stated. "So he has been speaking to Rishi. He’s attempting to encourage him, saying the UK are the good liberators, the good fighters. We want you. Rise to that."
The proposed evaluation of the warfare comes at a vital level within the battle. Key figures in Whitehall consider that Ukraine and Russia have fought themselves to a standstill.
The one method, they are saying, for one facet to drag forward is by considerably rising their provide of weaponry. Russia has successfully run out of provides. Ukraine can solely resupply weapons with the assistance of the US and the principle army powers in Europe, led by the UK.
Whitehall sources say that Admiral Sir Tony Radakin, the chief of the defence workers, delivered that message in diplomatic phrases in a lecture this week.
Sir Tony made clear the Russian army "cabinet is naked" and he appeared to challenge a rallying cry for continued help for Ukraine.
The chief of the defence workers advised the Royal United Companies Institute: "Extraordinary occasions name for a unprecedented response. This explains why Russia is shedding. And the free world is profitable… Offering we preserve our cohesion and resolve, the actual victory inside our grasp is rather more vital."
Ukraine additionally made an attraction this week for extra weaponry. Common Valery Zaluzhny, the pinnacle of the Ukrainian armed forces, advised the Economist: "I do know that I can beat this enemy. However I want sources. I want 300 tanks, 600-700 ifvs [infantry fighting vehicles], 500 Howitzers."
The US Congress gave the Pentagon approval in precept earlier this month to purchase substantial weaponry for Ukraine. However the Economist reported that this will likely not arrive in time for a spring offensive subsequent 12 months.
Some in Whitehall see this strategy as an indication of the innate warning on Ukraine by US President Joe Biden who is known to be involved about scary a wider world battle. There are some fears in Whitehall that Mr Sunak could find yourself encouraging Mr Biden's warning.
The supply advised Newsnight: "We now have stiffened the US resolve in any respect ranges – strain from us however all the time pleasant. We don't need Rishi to bolster Biden's warning. We wish him to pushing in the way in which Boris did."
You possibly can watch Nicholas Watt's full report on Newsnight at 22:30 GMT on BBC Two
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