US intelligence documents have been leaked online, revealing concerns about Ukraine’s ability to provide medium-range air defences and to amass sufficient troops and weaponry for its planned spring counter-offensive. The documents also warned that Ukraine was running out of its Soviet-era anti-aircraft missiles, which were still the backbone of its air defence. The leak has sparked a US criminal investigation into a breach posing a “very serious” risk to national security. The documents also suggest that the UK deployed around 50 special forces to Ukraine.
