During diplomacy, you should have the option of selling military aid to your ally or buying it.
It can be something like a lump sum of gold for a particular unit, or maybe a luxury for 20 turns in return for a number of units.
Some details:
The city manufacturing the equiptment and the buyer's capital must both have airports, or habours or roads. If they're connected by roads it would take probably 5 turns to deliver, habours 3 (2 after discovery of mass production due to transports ect) and 1 by airmail.
Other civilisations can demand the stop of arms sales. If you do happend to stop the trade, your reputation will take a hit, but then again, it may just save your behind.
By doing this, it can ensure that small struggling nations can also have a chance without having their bigger ally have all the fun and ultimately keep all the cities.
It can be something like a lump sum of gold for a particular unit, or maybe a luxury for 20 turns in return for a number of units.
Some details:
The city manufacturing the equiptment and the buyer's capital must both have airports, or habours or roads. If they're connected by roads it would take probably 5 turns to deliver, habours 3 (2 after discovery of mass production due to transports ect) and 1 by airmail.
Other civilisations can demand the stop of arms sales. If you do happend to stop the trade, your reputation will take a hit, but then again, it may just save your behind.
By doing this, it can ensure that small struggling nations can also have a chance without having their bigger ally have all the fun and ultimately keep all the cities.