It is, all trainings regarding e.g. combat, maintenance, etc. and transports are conducted via NATO and it's respective national armed forces. So is intel information. Collected,
gathered and analyzed by the various NATO intel communities and then centralized at NATO/NIFC/JIS and from there relayed to the Ukrainian MoD/intel branches.
This does not exclude e.g. the CIA giving such information to Ukraine without needing NATO consent or NATO even knowing about it.
GPS collected data need to be relayed via satellites and AWACS systems to e.g. HIMARS to hit a moving target - Ukraine does not have own satellites and AWACS , Google
does not provide an up-link to a HIMARS guidance control ground system or to its inertial navigation system within the individual missile. So it's guided via NATO or US
satellites - don't try to bring in e.g. Elon Musk into this.
The UDCG was instituted and is chaired solely by the USA, it's the primary tool for the USA in regards to gather and coordinate Ukraine support. - it's presiding members are
the respective defense ministers, chief of staffs, of all NATO countries and some non-NATO countries. It has no decision making ability without NATO or the respective members national governments consent. Why do you think e.g. Chancellor Scholz talks to Biden? or other heads of states? before a national parliamentary decision is done. And then relayed to NATO.
NATO doesn't just work for Ukraine alone - that is why the Ramstein-Contact Group was initiated. It's nothing else but a centralization of numerous sub-department/commissions of NATO (JWGDR, JWGDTC, NUC, CAP, etc. etc. (solely chaired and run by the USA). Unlike the e.g. Kosovo or Libya Contact Group.
Just as any instituted EU commission/contact group is chaired by the EU and run/directed by the EU or authorized to be run/conducted by a single EU member.
So to suggest that the EU migrant commission is independent to the EU is a ludicrous statement - just as stating the Ramstein-Group isn't NATO.