This is stated on the website of the alliance.
The topic of the speech is not specified.
NATO Secretary General Stoltenberg to make an unscheduled statement on September 30
2022-09-30T08:24:54.743Z
NATO Secretary General Jens Stoltenberg plans to hold an unscheduled press conference on Friday, September 30, starting at 18:00 (19:00 Moscow time).
Source: russiart