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Germany announces new defense aid for Ukraine worth $1.1 bln
(www.reuters.com)
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"Wir dürfen nicht" is very much an ambigous wording in the orignal German. Definitly doesn't imply that there is a legal issue.
And it seems there isn't. In fact, the main legal point here seems to be if providing the weapon can be done by the government or requires a vote from parliament. And it seems it wouldn't even require the vote.
This article goes into details behind the decision. (written by lawyer)