In addition to the above named may be included the Russian allied
ex-service men, an agreement having been entered into with the Russian
Ambassador now located in Washington, whose official status has not
changed since his appointment as a representative of the late Czar. When
medical, surgical, or hospital treatment is requested for a Russian
ex-service man, it must be approved in advance by the Russian
Ambassador, who certifies that any expense incident to this service will
be reimbursed by the Russian Ambassador.