NATO will mark the 75th anniversary of its founding with a ceremony in Brussels on Thursday amid a heightened Russian threat and lingering questions over the alliance’s future. NATO Secretary General Jens Stoltenberg is to lay a wreath while NATO foreign ministers are to give speeches recognizing the alliance’s importance for securing peace and freedom in the West. Ukrainian Foreign Minister Dmytro Kuleba, top EU diplomat Josep Borrell and representatives from NATO’s Indo-Pacific partners, Australia, Japan, South Korea and New Zealand are also set to join talks focused on the Ukraine war and r…