Not following the rules of the Vienna Convention on the Law of Treaties (VCLT) creates big problems in international law. Here are some of the issues that come from not sticking to these rules:

1. Loss of Credibility: When countries break treaty promises, it makes them look bad. This can make it much harder for them to make agreements in the future.

2. Increased Conflicts: Not following the rules can cause arguments between countries. These arguments can sometimes turn into bigger problems, like fights or wars.

3. Weakening of the Legal Framework: Ignoring the VCLT can damage the international laws we rely on. If countries think they can break agreements without consequences, it creates a situation where they don't feel they have to follow any rules.

4. Challenges in Enforcement: Right now, it’s hard to enforce these rules. When countries are wronged, they often don’t have many ways to get help or make things right.

To solve these problems, countries should:

• Work together and talk things out to settle disputes peacefully.
• Strengthen international organizations that can help keep an eye on whether countries are following the rules.
• Promote understanding and respect for international law through education and public awareness programs.