The jet is a Gulfstream V model. This was introduced by Gulfstream in 1997, and was top of the range when Cuban bought it.
The Boeing 737 Max family, which entered service eight years ago, was designed to be the latest and most advanced version of the Boeing 737 family, the most successful commercial aircraft of all time.
Russia's longest flights are to the tropical beaches of Venezuela, Bali, and Cuba (destinations free from Western sanctions).