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Without any other identifying features, it is hard to tell. I would pin it down to one of three things, though.

A walnut, sumac, or ash tree. Unfortunately, without any information on the tree, such as what country the tree is located (I'm not familiar with climate zone hd8, as we use a single number, single letter system here in the US Example: 5a) the smells of the leaves or bark, or any other information that you can give. The closest I can get you is the three that I have mentioned here.

Without any other identifying factors, it is very hard to say. This resembles several genus, and countless species within the genus.

I will give you my best guess based on the pictures and description.

I have pinned it down to a few Genus. Rhus, Sorbaria, and Sorbus. A sumac, false spirea, and quickbeam, respectively.

Getting rid of it will require you to dig it up, completely. Pouring boiling water on it a few times a day for two or three days will provide a quick death, as well. Other means will include herbicides, and chemicals, should boiling water fail. (It won't fail often)

This article will help: https://www.gardeningknowhow.com/plant-problems/weeds/using-herbicide-in-gardens.htm

You should harvest seeds when they are dark brown and dry. Boil water, remove from heat and add seeds. Let them soak for 24 hours to improve germination rate. Give them a dormancy period in the refrigerator for about 30 days. Plant seeds outdoors when danger of frost has passed. Choose a sunny site with well draining soil. Plant them about 3/4 inch deep. Water well.
Sumacs are native to the U.S. and not too picky about care.

https://www.gardeningknowhow.com/ornamental/trees/sumac/sumac-tree-info.htm

Poison sumac will have broader, more irregular leaves, as they are a completely different genus than Rhus. Poison sumac is in the Genus Toxicodendron.

Sumac, or Rhus has very long pointed leaves that lack the "fuzz" that sumac may have.

Here are some articles for more information:

https://www.gardeningknowhow.com/plant-problems/weeds/poison-sumac-control.htm

https://www.gardeningknowhow.com/ornamental/trees/sumac/sumac-tree-info.htm

Unfortunately, your photo did not come through. I am unable to see what is going on.

Many trees in the genus, Rhus are either male or female. It is possible that you have a male tree, as any pollen in the area will cause females to produce seed.

Here is an article that will help you care for the tree:

https://www.gardeningknowhow.com/ornamental/trees/sumac/sumac-tree-info.htm