This is said in the statement of the Spokesperson for Foreign & Commonwealth Office of the United Kingdom.
"The UK has growing concerns that Ukraine’s fight against corruption is being undermined. Corruption remains a major threat to Ukraine’s stability and national security and is cited by Ukraine’s electorate as the number one issue facing the country. The fight against it is fundamental to Ukraine’s European choice and its aspiration to become a modern, prosperous and democratic state," the statement reads.
As the British Foreign Office states, NABU, in which the UK has invested significant resource, “is a critical piece of the anti-corruption machinery in Ukraine, and has made great strides in its development and its investigations.”
"Recent events, including interference in NABU investigations and the exposing of NABU’s undercover officers, are a worrying sign that the future of independent anti-corruption investigations is under threat," says the statement.
The British Foreign & Commonwealth Office expresses hope that the authorities will show leadership in progressing a joined up reform effort to eradicate corruption.