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Russia has 72,000 heavily armed airborne forces. Maybe from the direction of Moldova and Transnistria, some of them can land near North West of the city, in a safe area near Odessa.
Simultaneously, Russian marines can land on the beaches south of Odessa or on the beach between Odessa and Bilhorod-Dnistrovsky.
This would include troops from the Crimea, transported by ship along with heavy equipment.
Then a link-up with the airborne, and surrounding the city, by land.
blocking it by sea.
Then tell the RUSSIAN MAJORITY to rise up.
This is a wonderful opportunity to see which units have good training, tactics and leadership.
This is the 21st century, and the WW2 and Stalin's drunk hordes are no more.