British spies are concerned that sharing anti-Russian information with the US government can lead to the coverage of their agents being blown up, security sources have told the mail on Sunday.
The sources said that British espionage referreds 'significantly rationed' what information they passed on to their counterparts in the CIA since Donald Trump won the presidential elections last year.
One source even claimed that some Western agents who were actively extracted in Russia and Ukraine – discreet and overland – as a protective measure, in view of the mitigating attitude of Mr Trump towards the Kremlin.
President Trump said this weekend that he thought it was “harder, to be honest, to deal with Ukraine” than Russia and reporters told that the US was doing very well with Moscow.
The Americans want Volodyymyr Zensky to sign a deal that would give them a great interest in the Ukrainian mineral resources and a truce with Moscow agree.
However, the Ukrainian president will not do this without fixed security guarantees. Mr. Trump's senior officials will travel to Saudi Arabia next week to discuss the plan with Mr Zelensky's team.
Last night Downing Street strongly denied that there had been some change in protocols for sharing information, but separate senior sources claimed that the agencies were taken by the agencies on an operational basis and without ministerial supervision or sanction.
Minister of Security Dan Jarvis is also supposed to have held meetings with Sir Richard Moore, head of MI6, and Sir Ken McCallum, head of MI5, with regard to the safety of British information.

The GCHQ headquarters in Gloucestershire. Spy Chiefs have shared information with American counterparts since Donald Trump was chosen as president

The concerns of agents have increased dramatically after Mr Trump's burning encounter with VolodyMyr Zenskyy
The worries of the agents have increased dramatically since Mr. Trump's spectacular fall-out with Mr Zelensky in the Oval Office last month, in which he accused the Ukrainian leader of being 'disrespectful' for the US.
He then paused both military aid and sharing information with Kiev, which effectively paralyzes his ability to defend himself against Russian attacks.
And it comes in the middle of a rise of spy supported by Moscow: on Friday, three Bulgarians were found guilty of making a Russian espionage unit that supervises an American military base and other individuals.
Although identifying intelligence, the electronic interception of communication is a highly integrated Anglo-American operation and difficult to disembark, old-fashioned human intelligence, with the help of agents on the ground, can be kept more different.
Agencies have been wary for Mr Trump since the case of Oleg Smolenkov, an alleged American spy at a high level that was said to have been extracted from Moscow in 2017 after Mr. Trump met Senior Russian officials, including Foreign Affairs Minister Sergei Lavrov.
Sources also said that the Five Eyes Intelligence Alliance between Australia, Canada, New Zealand, the United Kingdom and the United States could become an effective 'four eyes', while the old Commonwealth countries discuss forming a separate unity.
Last night a senior security source said: 'Intelligence collection is one of the few areas where the Americans still have a high esteem for Great Britain.
“We have always been careful with what we share with them in terms of protecting agents – with files marked” only for British eyes ” – but that is clearly more pronounced at times like this.

It comes in the midst of a rise of spy -supported spy in the UK, because three Bulgarians were found guilty of being part of a Russian spy unit
'The problem is mainly with rough intelligence, which can be very exposed by sources if it falls into the wrong hands. More care will be taken to pack the information to hide the origin. '
Another source said: 'It would be a too aggressive action to withdraw cooperation, and we don't want to provoke Trump's response. Last week we used a Reaper drone to attack the Islamic State in Syria, which we could not do without the US's support.
“But there has definitely been a shift from our open information. The UK also keeps an eye on what the US offers us to try to find out whether the US changes the volume of what Intel offers it '.
Diplomatic sources also said that the American security services were 'in a state of panic' above Mr. Trump and destroyed files that could expose assets in Russia.
It is said that they are worried that rough intelligence was now so widely spread in the system that it would be difficult to fully protect sources.
The care is exacerbated by the way in which Mr Trump replaces long -term officers with his loyal initiative.