Congratulations, you've made a mission
Good News: the score I'd give it has trebled
Bad News: it's only gone from 1 to 3 out of 10
Lag - noticeably improved: now bottoms at 8 and climbs rapidly back through the teens. For me it was playable.
Others - what else has been mentioned, works: the overview picture displays, the message appears, the mission ends and is debriefed.
The ending was somewhat abrupt, so I'd suggest putting in a small delay. Edit the Ending trigger and enter a small number of seconds in the 'TimeOut' boxes: 3,4,5 will give a random delay of 3 to 5 seconds; 4,4,4 will mean a consistent delay of 4 seconds.
Now comes the hard work, if you want it: balancing.
I accomplished the mission in 8 minutes with no real difficulty: too many fellow Russians survived (except when I killed them whilst RPGing the tanks - I managed 6 friendly kills one time!).
Your options:
1. Skill - raise that of Americans, lower Russians'
2. Remove Russians, or as described above, make them start as corpses