From what I read a few days ago one of the conditions for US aid under biden was that Ukraine make no strikes on russian soil. When trump pulled all the aid to Ukraine it was a huge blow, but also took the leash off.

After that all they had in their way was developing the actual drones and techniques to make the strikes, as well as planning them.

Ukraine has developed very impressive drone technology in a very short time. It is expected that multiple nations will actually try to make deals to acquire Ukrainian drones at the current NATO summit because they are so good now. So Ukraine is no longer dependent on others to sell them drones. They‘re selling them now.

For example, these drones can use terrain as guidance, so GPS isn’t required for navigation. This also allows them to fly at a very low altitude, avoiding Russian air defense. They’re also very resistant to jamming and have advanced autonomous capabilities, so they can “finish the job” on their own if the link to their operator is severed. Also, they’re very cheap, so it’s possible to overwhelm Russian defenses by swarming them.

In summary, they‘ve developed incredible killing machines that are able to act autonomously, which is very good for them right now but probably not very good for humanity in the long run.

They've been specifically targeting Russian Air defenses for awhile now forcing them to spread what little they do have even more. Since NATO have been pussies about providing them long range precision munitions they've had to spend time to develop their own cruise missiles like the Neptune and Flamingo the latter of which has entered regular production and has a range of 3000km.

https://en.wikipedia.org/wiki/FP-5_Flamingo

They basically reinvented the Nazi V1 with their Flamingo, and although only small % get through, it's devastatingly accurate against refineries.

Meanwhile, Russia uses the old Nazi strategy of launching very expensive rockets at apartments with civilians in cities, doing 0 strategic damage to Ukraine war capabilities, just like the Nazi V1 and later V2 was used and was relatively useless despite its high price.

Oh, and Ukraine can shoot at almost all Russia's refineries and weapons factories, but Russia can't do it back because Ukrainian can always import from refineries and factories in France, Germany, etc, beyond the NATO border...

Wanna know too

Its called adapting to new situation