This deliverable D3.3 aims to assess the need to extend the scope of TNA/VA programs beyond European geopolitical borders, with a particular focus on the specific needs and importance of collaboration with the United States and China. The choice of United States and China, although limited to 2 countries, are informative as they are countries with similar number of atmospheric research facilities as those in ATMO-ACCESS and good benchmarks for implementing reciprocal activities in future projects. The aim of this deliverable is to summarize and analyze the challenges of international access provision based on the work done in the ATMO-ACCESS project and provide recommendations to enhance international access to atmospheric RIs.