The US Department of Defense is still dealing with the consequences of one of the largest leaks of classified material in recent years, most of it relating to the war in Ukraine.

The documents, some marked “top secret”, paint a detailed picture of the war, including highly sensitive details of Ukraine’s preparations for a spring counter-offensive against Russian forces.

One document has piqued widespread interest.

It says that the UK is among a number of countries with special forces operating in Ukraine.

According to the document, dated March 23, the UK has the largest contingent (50), followed by Latvia (17), France (15), the US (14) and the Netherlands (1).

The document does not say where the forces are located or what they’re doing.

The numbers of personnel may be small, and will doubtless fluctuate. But special forces are by their very nature highly effective.

Their presence in Ukraine is likely to be seized upon by Moscow, which has in recent months argued that it is not just confronting Ukraine, but NATO as well.

In line with its standard policy on such matters, the UK’s Ministry of Defense has not commented, but in a tweet on Tuesday said the leak of alleged classified information had demonstrated what it called a “serious level of inaccuracy”.

“Readers should be cautious about taking at face value allegations that have the potential to spread misinformation,” it said.

It didn’t elaborate, or suggest which specific documents it was referring to. However, Pentagon officials are quoted as saying the documents are real.

One document, which detailed the number of casualties suffered in Ukraine on both sides, did appear to have been doctored.

UK special forces are made up of several elite military units with distinct areas of expertise, and are regarded to be among the most capable in the world.

The British government has a policy of not commenting on its special forces, in contrast to other countries including the US.

The UK has been vociferous in its support of Ukraine, and is the second largest donor after the US of military aid to Kyiv.