There are TikTok videos of Ukrainians fabricating hedge hogs, improvised spike strip chains, and so forth. M
And as far as modern tanks goes physics doesn’t change just because 80 years has passed. Everything I’ve read says up to medium tanks have difficulty and maybe even heavier tanks. Certainly wheeled vehicles and so forth will too. And even if a tank can get through then they will definitely slow them down perhaps making a good ambush point. The Russians so far don’t seem too hot on tactics and experience at this point so if the Ukrainians can dig in well armed and drilled defense forces the armor will be meat and drink in urban combat.