Whilst Ukraine is not a formal member of NATO, for all practical purposes Ukraine has become a de-facto member of NATO. The US, Britain, and many other countries have supplied large numbers of weapons to Ukraine, including sophisticated ones, such as drones, and modern anti-tank missiles.
The US has biological weapons labs in Ukraine, many close to the Russian border. Approximately 260,000 Ukrainian troops have been trained to NATO standards by the US military. The Russians have stated since 2008, that NATO expansion into Ukraine, is an existential threat, because the US could then put nuclear missiles in Ukraine, pointing at Russia..