It seems that most on this forum are ignoring some facts.
Russian airspace and now Polish airspace are open.
President Medvedev is en route to Poland for the funeral.
Have a look at the excellent domodedovo.ru web site (English available)
If the Russian president flies, it might be ok for everyone else to fly. Some attemps have been made on this forum by courageous people to highlight Russian experience with flying in an ash cloud environment but interestingly these comments are usually ignored or very simply commented.
I have the feeling that I am reading a Union forum about eachother's rights and obligations rather than a scientific/engineering debate on how to tackle/deal with the problem.
On the Polish crash forum there was a lot of contributions from Russian pilots, it would be interesting to see their opinion if someone knows how to link up with them. (Please spare me the many derogative/non PC comments about Russians, they are childish at best).