Ignorant people in every country criticize their leaders for travelling overseas too much. Yet we live in a one-world conglomeration where everything that's important has international causes & effects - economy & investments, technology & comms, security & defence, population movements, climate change and on & on.
If you want your country to be part of the decisions that will affect your country, then you need to accept that your country must be represented at the appropriate levels at the many many international meetings.