TOKYO (Reuters) - The Group of Seven finance ministers will invite their counterpart from Ukraine to participate in a session on the global economy, Japan's top financial diplomat Masato Kanda said on Tuesday.

The biggest challenge regarding sanctions against Russia is circumvention, Kanda told reporters, adding that the G7 will keep up sanctions against Russia.

(Reporting by Tetsushi Kajimoto; Editing by Kevin Liffey)