Grand Theft Auto 4 Episode 35: Wrong is Right

"Yusuf wants to take an attack helicopter called the Buzzard. This aircraft belongs to a group of arms dealers and is located on a yacht."
"Niko meets Michelle, outside an office building in Algonquin, and introduces him to her boss, a government agent addressed as "The Contact", The Contact tells Niko to gather information on a man named Oleg Minkov."