Russia appears to be testing its Nudol ASAT system from Plesetsk. It issued a NOTAM warning that closed several areas on 14 June 2019. The closed areas look very much like those that were closed in April 2018 and in December 2018.

Interestingly, these areas were closed again on 30 June 2019. It's possible that it was the 14 June test that was postponed, rather than the second test in about two weeks.

(My big thanks to Evegeny Maksimov for publishing this information.)