International Congress of Mathematics, 1982

At seven All-Union Algebra Conferences and five other All-Union Conferences , U.S.S.R. (1969-1990)

Algebra Conference, Halle, 1986

International Conference "Groups-St Andrews-1989" (four lectures)

International Conference on Group Theory, Debrecen, 1990

Fifth Congress of Vietnamese Mathematicians, 1990

Workshop in Geometric and Combinatorial Methods in Group Theory, Edinburgh, 1993

Group Theory Conference, Spetses, Greece, 1993

Group Theory and Topology Workshop, Albany, NY, 1993

Geometrical and Homological Methods in Group Theory, Durham, UK, 1994 (three lectures)

Third International Conference in Group Theory, Pusan, Korea, 1994

International Conference in Groups and Group Rings, Gliwice, Poland, 1994

Conference on Generators and Relations in Groups, Cortona, Italy, 1994 (8 lectures)

International Algebra Conference, Jerusalem, 1996

International Conference on Modern Algebra and Its Applications, Nashville, USA, 1996

International Conference on Geometric and Combinatorial Group Theory, Canberra, Australia, 1996

International Conference on Group Theory, Montreal, Canada, 1996

International Algebra Conference, St. Petersburg, 1997

International Algebra Conference, Hong Kong, 1997

Malcev Algebra Conference, Novosibirsk , 1997

International Conference "Groups-St Andrews-1997" (two lectures)

Conference on Geometric Group Theory, Mobile, AL, 1998

Conference on Combinatorial Methods in Algebra, Fayetteville, 1998

International Conference on Algorithmic Problems in Groups and Semigroups, Lincoln, USA, 1998

International Conference in Group Theory, Pusan, Korea, 1998

International Conference on Combinatorial and Computational Methods in Mathematics, Omsk, Russia, 1998

Conference in Algebra, Moscow, 1999

International Conference in Algebra, Hong Kong, 1999

Wasatch Topology Conference, Park City, 1999 (two lectures)

International Conference in Logic and applications, Novosibirsk, 2000

International Conference in Group Theory, Edmonton, 2000

Groups, Rings, Lie and Hopf Algebras, St.John's (Canada), 2001 (two lectures)

International Conference in Algebra, Sumy (Ukraine), 2001 (two lectures)

Euroconference in Algebra and Discrete Mathematics, Hattingen (Germany), 2001 (two lectures)

Intern. Math. Conf., Kiev (Ukraine), 2002

Intern. Conf. "Algebra -- Geometry and Intersections", Hattingen (Germany), 2002

Intern. Conf. In Algebra, Krasnoyarsk (Russia), 2002

Geometric Group Theory Conf., Pensacola (Florida), 2002

Intern. Conf. in Algebra and Number Theory, Tula (Russia), May 2003

Conference in Combinatorics, Dynamics and Geometry of Groups, Gaeta (Italy), May-June 2003

4th Ukrainian Algebraic Conference, Lviv (Ukraine), August 2003

53rd Algebra Day in Ottawa (Canada), Sept. 27, 2003

Intern. Conf. in Algebra, Moscow (Russia), June 2004

Workshop on K-theory and the Geometry of Groups, Honolulu (Hawaii), Jan. 2005

Conference in Groups and Group Rings, Bedlevo (Poland), June 2005

Geometric and Probabilistic Methods in Group Theory, Geneva (Switzerland), June 2005

5-th Ukrainian Conference in Algebra and Number Theory, July 2005

Asymptotic invariants and Geometric and Probabilistic Methods in Group Theory and Dynamical Systems, College Station (Texas), Nov. 2005

Group Theory, conference in Ischia (Italy), March-Apr. 2006

Geometric and Combinatorial Group Theory, conference in Nashville, May 2006

Conference in Group Theory, Nalchik (Russia), July 2006

Workshop in Combinatorial Group Theory, Novosibirsk (Russia), August 2006

Workshop in Group Theory, Kiev (Ukraine), Dec. 2006.

Conference in Algebra and Geometry, Erevan (Armenia), May 2007.

Conference "Algebraic Days in Antalya IX", Antalya (Turkey), May 2007.

2-d Congress in Algebra and Combinatorics, Beijing - Xi'an (China), July 2007.

International Conference "Algebra and its Applications", Krasnoyarsk (Russia), August 2007.

Conference in honor of Wilhelm Magnus, New York, Sep. 2007.

Workshop on Asymptotic Group Theory and Cryptography, Ottawa (Canada), Dec. 2007

Colloquium talk at the Mathematical Institute in Cuernavaca (Mexico), March 2008

Conference "Group Theory and Related Topics", Xuzhou (China), April 2008

Intern. Algebraic Kurosh Conference, Moscow (Russia), May-June, 2008

Workshop "Profinite and Asymptotic Group Theory" Oberwolfach, June, 2008

Conference and workshop in Group Theory, Chelyabinsk (Russia), Aug. 2008