President Volodymyr Zelensky has signed a law allowing Ukraine’s Armed Forces to be sent abroad during martial law, according to an official decree published on March 17.
Archived version: https://archive.is/newest/https://kyivindependent.com/zelensky-signs-law-permitting-ukrainian-troops-to-operate-abroad-during-martial-law/
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Certainly sounds like it.
Altho there are many seemingly good targets, such targets will be counted against their country.
So spies whacking Putin would be lauded. Spies whacking fElon would be punished.
The world is governed by opinions. And Ukraine only has the authority of some of those opinions. The US would need to attack other allies (like invading Greenland, Panama, Canada) for Ukraine to have support for whacking US targets. At which point other counties would likely jump on the bandwagon!