EU countries did an important practice. It was about help during an attack. We call this the help rule. If someone attacks one EU country, others must help.
Ambassadors and experts took part in the practice. They used a fake example for safety. It was about hybrid attacks. These are computer attacks on the power grid.
The EU wants to be more independent from the USA. Donald Trump weakened trust in NATO. NATO is a big military alliance. US soldiers will leave Germany.
Chancellor Friedrich Merz wants to strengthen EU rules. The EU rule is stricter than the NATO rule. All EU countries must help immediately in an emergency. This help happened 1 time before.
This was after terror attacks in Paris in 2015. Germany helped to fight the IS group after that. The new practice shall make Europe better prepared for danger. The results of the practice remain secret for now.