Summarized: The article discusses former Finnish Prime Minister Sanna Marin’s views on Europe’s response to the Ukraine war. Marin argues that it is morally and strategically unacceptable for Russia to outspend Ukraine on defense. She suggests that Europe could close the resource gap between Ukraine and Russia by allocating just 0.2% of its GDP. Marin emphasizes that supporting Ukraine is a matter of will and that Europe must take leadership in its own security. She also notes that Europe can no longer rely solely on transatlantic cooperation for its defense. Marin’s comments were made in the context of a report by the Tony Blair Institute for Global Change, where she now works as a strategic advisor.
“world police” means doing police work at a global level.
Police fundamentally exist so that individuals can outsource their security to the state. Police disincentivize coercion by maintaining the ability to do violence and doing violence on those who use violence. It allows individuals to not have to think about physical in order to move freely.
“world police” means one country’s military defending other countries so that those countries don’t have to maintain a military or handle their own security.
The meaning of the phrase is inherent to the phrase’s word: it just means playing a police role (punishing aggression between third parties to maintain a peaceful atmosphere) for the world (planet Earth).