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https://nltimes.nl/2021/06/06/netherlands-favor-g7-plan-eliminate-tax-havens

Vijlbrief also said he is working on implementing the agreement as
soon as possible in the EU. The G7 countries all already have a
corporate tax rate of 15 percent, yet in the EU some countries are
below that level. In Ireland and Cyprus company tax rates are only
12.5 percent and in Hungary only nine percent.

What are some existing mechanisms within the EU that can help with that and does this mechanisms go against a country's sovereignty or not?