Russian response to sinking of ship and prep for new ground op

 ISW:

Ukraine’s sinking of the Moskva was a significant event that has likely triggered intensified Russian air and missile attacks in retaliation, but the decisive operations of this phase of the war will still be conducted on the ground in eastern Ukraine. The commitment of the Black Sea Fleet’s naval infantry to the fight around Mariupol some weeks ago meant that Russian naval operations would play a supporting role in the conflict. Increased Russian air and missile attacks are also unlikely to have a decisive impact on the outcome of the war, since there is no reason to assess that Russia has been holding enough air and missile capability in reserve to tip the balance if it is now committed. This report, and likely future reports as well, will thus remain focused on the ground operations, especially those in eastern Ukraine.

Russian forces continued to amass troops around Izyum in preparation for continuing offensive operations in eastern Ukraine. The Russians continued small-scale attacks in the vicinities of Izyum, Popasna, and the area around Rubizhne and Severodonetsk—sometimes with artillery, sometimes with mechanized forces. These attacks have not made significant gains so far. It is unclear if they are part of a rolling offensive operation into which Russian reinforcements will be fed as they become available or if they are setting conditions for a larger-scale, better-coordinated offensive that will start soon.

The specific terrain on which battles in eastern Ukraine will be fought may constrain the Russians’ ability to take advantage of the number of forces they are amassing for the attack. Eastern Ukraine is famous for being superb terrain for large-scale mechanized maneuver because of the World War II campaigns of the Wehrmacht and the Red Army. It is far from clear, however, that Russian forces will find it much more conducive to rapid decisive mechanized operations than other parts of the theater. The Russians have struggled repeatedly to seize built-up areas rapidly or even to reduce them once encircled. They will have to seize several significant population centers to achieve their apparent objectives in Donetsk and Luhansk oblasts, however, including Severodonetsk, Rubizhne, Lysychansk, Slovyansk, and Kramatorsk, as well as several smaller towns. The difficulties they have encountered taking Rubizhne do not bode well for their rapid success against other built-up areas. The ground itself is also challenging as it is crisscrossed by many small water features and, at the moment, still very muddy. The reinforcements the Russians are bringing into this part of the theater will help, of course, but large numbers of much fresher Russian troops struggled to take relatively small population centers north, west, and northeast of Kyiv even before getting into the Kyiv suburbs proper. The Russians must take the major population centers in Donetsk and Luhansk, however, if they are to achieve the operation’s stated goals.
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The Russians have already experienced significant losses to their mechanized forces.  Their tanks and other armor have been destroyed by Javelin missiles and missiles from the UK and Germany.  They have also been attacked by Ukraine tanks and artillery.  The Russian operations would be vulnerable to air ops by A-10s if they had them.  So far, the Russians have shown little skill in combat.  They have concentrated much of their operations on turning buildings to rubble and killing civilians.  Their operations in open terrain have not seen much success.