(ANSA) - LUBIANA - ''We should guarantee the sustainability of the progress made and resolve outstanding issues to foster cooperation and build trustful dialogue. Only a commitment such as this will allow the countries in the region to focus on challenges such as security, terrorism and immigration'', Slovenia's Prime Minister Miro Cerar said during the Adriatic Charter Summit, which he attended being his country crucial to regional balance. The Adriatic Charter aims at supporting the Euro-Atlantic integration of Southeastern Europe and consists of the United States, Albania, Bosnia and Herzegovina, Croatia, FYROM, along with Serbia and Kosovo playing the role of observers and Montenegro who joined the NATO a few months ago. On the sidelines of this meeting, Cerar had bilateral meetings with US Vice President Mike Pence, Montenegrin premier Duko Markovic and his Croatian counterpart Andrej Plenkovic. Cerar reiterated to Plenkovic Slovenia's stance over the implementation of the arbitration verdict on the borders between the two countries. ''The key to regional stability - Slovenia's prime minister emphasized- is strengthening the rule of law and the respect for fundamental human rights and democratic values''. (ANSA).