Ukrainian forces have damaged an advanced Russian Su-57 jet hundreds of miles away from the front lines inside Moscow's internationally recognized territory, Kyiv's military spy agency said on Sunday, adding this is the "first such case in history." An Su-57 jet was struck on Saturday at the Akhtubinsk airfield, in the southern Russian republic of Astrakhan, Kyiv's GUR military intelligence agency said in a statement. The site is around 365 miles from the current front lines in eastern Ukraine, according to the GUR. One of Russia's influential military bloggers—often considered sources for information on losses in lieu of official commentary...