This situation is excluded from being a Double Foul as the Foul by R1 was a non-player foul (10-2-1)
The first foul, by K, is Illegal Participation (9-6-4c) (S28)
The second foul, by R, is Illegal Substitution (3-7-6)
So far...for the purpose of penalty enforcement,
K has committed a live ball foul (9-6-4c)
R committed a dead ball foul (3-7-6, 10-4-5c)
However, not to be a party pooper but I have four questions before I can make a ruling:
1) Were there any additional penalties?
2) How did the kick end?
3) How did the play end?
4) Where did the play end?