Where does I2a2a-M223 (old I2b1) come from?

I was trying to get some information about I2b1 (M223) to understand its origin and migration. To get a first impression about the distribution of M223, below is a map based on SMGF. The peak area of I2b1 seems to be in Central Germany.

Chiaronia et al., 2009 presented a map of M223, too.

Balanovsky et al. 2008 tested for the SNP M223 and found it in several individuals from Russia. 
Vologda (2/121=1.7%)
Unzha (2/52=3.8%)
Kashin (3/73=4.1%)
Livni (1/110=0.9%)
Belgorod (1/143=0.7%)
Kuban Cossacs (2/90=2.2%)

I am still collecting I2b1 data, I will update this post later today.

Edit:
In older publications M223 is also called I1c.

M223 frequency in Europe (From Table 1 in Rootsi et al., 2004):
Portuguese (5/303=1.6%)
Madeiran (Portugal) (2/132=1.5%)
Azorean (Portugal) (2/121=1.6%)
Cape Verde Islanders (1/201=0.5%)
Italian (northern Italy) (2/194=1.0%)
Italian (central Italy) (6/196=3.0%)
Italian (Calabria) (2/148=1.4%)
Italian (Albanese origin) (3/78=3.8%)
Italian (Sardinia) (2/142=1.4%)
French (Southern France) (1/38=5.3%)
French (Low Normandy) (1/42=4.8%)
French (Lyon, Poitier) (1/99=1.0%)
German (2/16=12.5%)
Dutch (3/30=10%)
Swedish (South Sweden) (6/168=3.6)
Norwegian (1/72=1.4%)
Estonian (1/210=0.5%)
Latvian (1/86=1.2%)
Polish (2/191=1.0%)
Czech and Slovak (2/198=1.0%)
Hungarian (2/162=1.2%)
Byelorussian (1/147=0.7%)
Ukrainian (3/585=0.5%)
Russian (Kostroma region) (2/53=3.7%)
Russian (Belgorod region) (1/144=0.7%)
Russian (Cossacks) (2/97=2.0%)
Russian (Adygea) (1/78=1.3%)
Mordvin (4/83=4.8%)
Chuvashes (2/80=2.5%)
Slovenian (1/55=1.8%)
Croat (mainland) (1/189=0.5%)
Albanian (4/106=3.8%)
Romanian (7/361=1.9%)
Moldavian (2/60=3.3%)
Gagauz (Moldova) (4/79=5.1%)
Greek (4/261=1.5%)
Turkey (5/741=0.7%)
Lebanese (1/66=1.5%)

The map based on Rootsi et al., 2004:

 The number of tested Germans and Dutch is actually very low in this paper (N=16 and N=30, respectively), so the frequency in this region might be off.

The network of haplogroup I was obtained by using the biallelic markers and six STR loci (DYS19, DYS388, DYS390, DYS391, DYS392, and DYS393) in 533 Hg I chromosomes from 34 populations:

  Interestingly, the Near Eastern STR haplotypes of I1c (M223) and I1a (M253) are both in the 'core' of their haplogroups, respectively.

It is also interesting to note that M223 is the one of the oldest SNPs in haplogroup I.