Since 2015?
https://www.defensenews.com/land/2015/01/21/us-trainers-to-deploy-to-ukraine/
The American training effort comes as part of a US State Department initiative "to assist Ukraine in strengthening its law enforcement capabilities, conduct internal defense, and maintain rule of law" Pentagon spokeswoman Lt. Col. Vanessa Hillman told Defense News.
After meeting with commander of the Ukrainian Armed Forces Lt. Gen. Anatoliy Pushnyakov and acting commander of the National Guard Lt. Gen. Oleksandr Kryvyenko during his visit, Hodges said he was "impressed by the readiness of both military and civil leadership to change and reform."
The training was requested by the Ukrainian government "as they work to reform their police forces and establish their newly formed National Guard," Hillman added. Funding for the initiative is coming from the congressionally-authorized Global Security Contingency Fund (GSCF), which was requested by the Obama administration in the fiscal 2015 budget to help train and equip the armed forces of allies around the globe.
The training mission has been the subject of plenty of discussion among US policy makers for months, and the United States has already earmarked $19 million to help build the Ukrainian National Guard.
"We're very open to the idea that this becomes a first step in further training for the Ukrainian military," Derek Chollet, former assistant secretary of defense for international security affairs, told Defense News just before he left the Pentagon on Jan. 17.
He was quick to add that he doesn't anticipate that this training mission "will require significant US presence."
The mission comes at a time of increasing concern among Eastern European countries that Russian aggression in the region will increase, and as fighting around the eastern Ukrainian city of Donetsk between government forces and Russian-backed separatist rebels rages on.