Russia 's President, Vladimir Putin, has suffered an 'epic fail' in Ukraine, the head of Britain's foreign intelligence service says.
Richard Moore, the chief of the UK Secret Intelligence Service (MI6) has said that Putin's forces may have to pause the advances on Ukraine in the coming weeks.
He added that while the war is "obviously not over", Russian invaders may be starting "to run out of steam".
In a rare public appearance, Moore spoke at the Aspen Security Forum in the US, he said: "I think he has suffered a strategic failure in Ukraine. It is obviously not over.
"He has obviously made, and the Russian forces have made, some incremental progress over recent weeks and months but it is tiny amounts.
"We are talking about a small number of miles of advance. When they take a town, there is nothing left. It is obliterated."
Continuing his speech, the MI6 chief added: "And I think they are about to run out of steam. I think our assessment is that the Russians will increasingly find it difficult to supply manpower over the next few weeks.
"They will have to pause in some way and that will give Ukrainians opportunities to strike back. Their morale is still high. They are starting to receive increasing amounts of good weaponry."
With winter looming, and pressure on gas supplies growing, "we are in for a tough time", according to Mr Moore - who believes a Ukrainian fightback could spread benefits across Europe.
He said: "It is important I think to the Ukrainians themselves that they demonstrate their ability to strike back. I think that will be very important for their continuing high morale.
"I also think, to be honest, it will be an important reminder to the rest of Europe that this is a winnable campaign by the Ukrainians."
The invasion has also triggered widespread sanctions against the Russian regime, but Moore believes the "pretty concerted effort" against Russia has led to the expulsion of "something roughly north of 400" intelligence officers who were operating under diplomatic cover."
"We reckon in the UK that has probably reduced their ability to do their business to spy for Russian in Europe by half," he added.
When it comes to recruiting disaffected Russian officials to spy for Britain, he said that: "Our door is always open".
On China, he said MI6 had "never had any illusions whatsoever about Communist China".
But, he thinks "it is too early to tell what lessons they (China) will draw from Putin's misadventures in Ukraine" but China's President "Xi Jinping is watching this like a hawk".
This makes it "essential" that "we tough it out on Ukraine". Expanding on this, he suggested that we keep going through the winter to help the Ukrainians win the war, and negotiate from a position of significant strength.
Moore also went on to claim that Russia and China have a relationship that is based on the idea of "no limits", meaning the Chinese are helping the Russians over Ukraine by buying their oil, according to Mr Moore.
He added: "They are right on the front foot of beating the Russian drum and selling the Russian narrative around Ukraine and doing it without any sense of irony.
"This is a country that spends a lot of time banging on about sovereignty and territorial integrity and here is the most egregious example of someone tearing that up in Europe and the Chinese keep on selling their snake oil around the world.
"It feels pretty tight but it is not an equal partnership. Ukraine has made it less equal.
"Moscow is very much the junior and the Chinese are very much in the driver's seat."
Meanwhile the conference heard that there is no evidence the Russian leader is suffering from serious ill health, adding that "the reality of what they were about to encounter was just not being briefed up".
