A blunt statement, accompanied by a slickly produced video of Ukrainian troops preparing for battle, appeared designed to rally the nation and to spread anxiety among Russian forces.
Defense Department officials had previously said that about 31 tanks would be sent to Germany to be used in a training program that is expected to take 10 to 12 weeks.
West Germany joined NATO in 1955, choosing security over immediate territorial integrity. Some suggest the same path could be the best guarantee for Ukraine.
American spy agencies do not know exactly who carried out the attack this month, but suggest it was part of a series of covert operations orchestrated by Ukraine’s security services.
At least three of what appeared to be American-made tactical vehicles known as MRAPs were part of the cross-border attack. According to visual evidence, Russia captured two of them.
The cross-border attacks by fighters aligned with Ukraine were an effort to force Russia’s military to divert troops from the front line, an official said.