April 29 (UPI) -- NATO Secretary-General Jens Stoltenberg told Ukrainian President Volodymyr Zelensky in a surprise visit to Kyiv on Monday that help was on the way after a winter that saw Russia make incremental advances in its invasion of its neighbor. Stoltenberg, acknowledging delays by the United States and other allies in getting additional aid to Ukraine , said the country fought valiantly in limiting successes by Moscow and will now have a chance to turn their fortunes around.