SEOUL, South Korea (AP) — North Korean leader Kim Jong Un has peered into the cockpit of Russia’s most advanced fighter jet at an aircraft factory on his extended visit to the country. Kim’s rare foreign trip has raised concerns about banned weapons transfer deals between increasingly isolated countries. He has met President Vladimir Putin and visited weapons and technology sites on his trip, underscoring deepening ties between the nations. Foreign governments and experts speculate Kim will likely supply ammunition to Russia for its war efforts in Ukraine in exchange for receiving advanced weapons or technology from Russia. Russia’s Cabinet on Friday released video showing Kim looking at the cockpit of the Su-57 while listening to its pilot.