“We could only solve our problems by cooperating with other countries. It would have been paradoxical not to cooperate.”

Simplified Meaning:

When countries work together, they can solve problems that one country alone might not be able to fix. For example, if a river runs through several countries, one country can't keep the water clean by itself. All the countries need to agree on rules to stop pollution for the river to stay clean. It would be strange and not make sense if they didn't work together on this issue because everyone benefits from the clean water. By collaborating, they combine their knowledge, resources, and efforts, making it easier to tackle the problem. Just like in a group project at school, if everyone does their part, the project becomes much easier and better. This advice means that we should look for ways to cooperate and help each other rather than trying to solve everything alone. In our lives, this could mean working with neighbors to improve the community or teaming up with coworkers to handle big tasks more effectively.