Ahead of Nepalese Prime Minister Pushpa Kamal Dahal's visit to India, Nepal today made it clear that the issue of Constitution amendment was an internal matter. However, it said that both countries need to introspect on past issues like the blockade. Nepalese Foreign Minister Prakash Sharan Mahat said in New Delhi that all bilateral problems need to be conveyed only through diplomatic channels.<br/><br/>He also assured full cooperation to India on security issues and said, Nepal will not allow its soil to be used against India. Pushpa Kamal Dahal, also known as Prachanda will be visiting India on his four-day tour from Thursday. Nepal's ties with India had strained after a months-long border blockade last year by the ethnic minority protesters over the new Constitution which they claim is discriminatory to their interest. The then Oli government had accused India of imposing an unofficial blockade on the landlocked nation to support the Madhesi demand of more political representation.