I am basing on it on the initial incursions and the following subsequent adjustments to the battle. They are obviously fully committed and they are not achieving their goals. It is not logical that they would utilize this overwhelming military and weapons to achieve the adjusted and limited aims they now have in Ukraine. They have already used these weapons fairly significantly. so it is not a matter of Russian legal constraint.
You are the one making the argument that they have this overwhelming military power. So conversely you can search and provide the sources that shows Russian has a military of achieving the results you propose.
What to be gained by declaring war
The consensus is the only tool declaring war would give Putin would be the draft. That and mobilizing the Russian population to support the war.
They have already changed some press laws criminalizing speaking out against the war. They are also now changing a law that allows older service members to reenlist.
Russian leader could use Victory Day celebrations to stage ‘greater call to arms’
www.independent.co.uk
Russia’s actually declaring war would represent a major shift in how Russian President Vladimir Putin and his colleagues publicly address the conflict.
www.pennlive.com
The Russian government blocked access for its citizens to Facebook and Twitter on Friday as its invasion of Ukraine showed no signs of letting up.
www.yahoo.com
Legislation would allow recruitment of older professionals as military faces infantry shortage
www.theguardian.com