(ANSA) - BELGRADE, APR 28 - "The Three Seas Initiative (TSI) promotes transatlantic cooperation while also ensuring the United States' strategic presence on NATO and the European Union's eastern flank" and "the countries of this region must not only steadily increase defence funding but also rapidly develop their defence industries," Lithuanian President Gitanas Nauseda said today at the TSI Summit in Dubrovnik. (ANSA).