Russia used short-range ballistic missiles or similar weapons to attack the Pechenihy dam on the Siverskyi Donets River in northeast Ukraine this week, the British military said on Saturday.

The attack on September 21 and 22 followed an earlier one on September 15 on the Karachunivske dam near Krivyi Rih in central Ukraine, according to the Defense Ministry’s daily intelligence briefing, adding that Ukrainian forces are pushing farther downstream along both rivers.

Russian commanders may be attempting to strike sluice gates of the dams in order to flood Ukrainian military crossing points, the ministry said in its bulletin released on Twitter.

The attacks are unlikely to have caused significant disruption to Ukrainian operations due to distance between damaged dams and combat zones, according to the ministry.