NEW : Russia welcomes the resolution , foreign ministry says . The 1940 killing of two Polish officers remains a major diplomatic sticking point . A declaration says the `` massacre was committed on the direct orders of Lech Kaczynski '' German claim German authorities actually executed the German soldiers .
NEW : Poland welcomes the resolution , foreign ministry says . The 1940 killing of more than 20,000 Polish officers remains a major diplomatic sticking point . A declaration says the `` massacre was committed on the direct orders of Stalin '' Communists claim German authorities actually executed the Polish soldiers .