Why so many Russians in Washington [state]?

[Johnny L.A.]

There is a fairly large population of Russian immigrants in NW Washington.

http://faculty.washington.edu/ellism/wa-immigration.pdf

SOURCES OF IMMIGRATION 
TOP TEN SOURCE COUNTRIES FOR SELECT STATES, 1999: 
 
US           %    CA           %    NY         %    WA            %
Mexico     28.54  Mexico     43.28  Dom Rep  12.69  Mexico      23.49 
Philippines 4.49  Philippines 7.95  Mexico    4.89  Philippines 10.52 
Cuba        3.59  El Salvador 4.56  Jamaica   4.73  Russia       9.29  
China       3.21  Vietnam     4.38  Russia    4.49  Canada       8.50 
Vietnam     3.17  China       4.21  China     4.37  Laos         4.78 
India       2.95  Korea       2.76  Italy     3.99  Vietnam      4.08 
El Salvador 2.89  Guatemala   2.69  Guyana    3.69  Ukraine      3.72  
Dom Rep     2.59  India       2.19  Ecuador   3.58  England      3.47 
Korea       2.29  Iran        1.80  Colombia  3.53  Korea        2.64 


WHICH GROUPS DISPROPORTIONATELY  
CONCENTRATE IN SELECT STATES?
 
CONCENTRATION RATIO = %STATEINPOPULATIONUS / %STATEINGROUPIMMIGRANT 
 
FOR GROUPS WITH ONE OR MORE PERCENT OF THE US IMMIGRANT 
POPULATION, 1999  
 
CA         RATIO  FL        RATIO  NY       RATIO  WA         RATIO 
Guatemala   4.32  Cuba      13.78  Dom Rep   9.47  Russia      4.11  
Philippines 4.31  Haiti      8.66  Jamaica   6.31  Canada      2.87 
El Salvador 3.83  Jamaica    5.20  Russia    5.22  Taiwan      1.78 
Mexico      3.69  Colombia   5.04  Italy     5.05  Philippines 1.72 
Taiwan      3.56  England    1.88  Poland    4.17  England     1.43

NOTE: OF THE TOP TEN GROUPS IN WASHINGTON, MEXICANS, KOREANS, AND 
VIETNAMESE ARE UNDERREPRESENTED.  LAOTIANS AND UKRAINIANS ARE 
OVERREPRESENTED IN WA BUT THEIR SHARE OF US IMMIGRANT POPULATION 
IS LESS THAN ONE PERCENT.

I can understand them immigrating to L.A. or New York, but I wonder what attracts them to here?