The conflicts between Russia and Ukraine go back far longer than the last 10 years. In 1659, 80,000 soldiers met at Konotop during a portion of history known as the Ruin to most Ukrainians.

The battle started poorly for the Ukrainians, who were forced to flee the fortress. The Russians besieged the fortress for 70 days until 30,000 Cossacks under Mehmed IV Giray came forth to relieve the siege. At the time, Ukraine was controlled by many different factions who had loose alliances to defend each other when they were not attacking each other. It was closer to how Italy operated with the various cities and families than a unified country.

Crimean Khanate (Ukraine)
Mehmed IV Giray (relief force) 30,000
Krzysztof Laski (relief force) 4,000
Ivan Vyhovsky (besieged force) 20,000

Russia
Alexey Trubetsky 29,000
Ivan Bezpaly 7,000

Wargame Scenario
For use with Pike and Shotte or other similar systems
2 to 3 Players
Armies similar in points: The Ukrainian force, with relief, should have about 20% more than the Russians, who should have more elite troops.

Objective
Ukraine breaks the siege and causes the Russians to rout. Russia routes the relief force while keeping the Ukrainians in their fortress.

Set-Up
Create a small fort or castle and place the Ukrainian infantry inside with their command. The Russians should be in a siege position with artillery focused on the Fort. The relief force should be cavalry-focused with many horse archers/crossbows and placed on one side of the board.

Special Rules

It is not really a rule, but you want the armies to be highly mobile and have the battlefield be very fluid without much debris.