Putin advantage (outside of nuclear weapon) has always been artillery and air superiority but Ukraine has counter this by using very effective air defense system and Ukraine has demonstrated they have the superior infantry. What Putin has done after retreating to a defensive position is use the same strategy as early in the invasion in Mariupol and try to bomb the shit out of Ukraine to a point he is running out of artillery and now relying on North Korea for supplies. But this isn't as effective anymore given Ukraine has access to very effective anti air defense system but in the end, ground troops will win this war and not artillery (outside of nuclear weapon) so Putin still need to send troop to fight like what happen at Mariupol, this is were Ukraine will have a major advantage.
