I lived in USSR, and suppression of speech and opposition is exactly needed to have such high popularity. The transition into 199x shown that informed population doesn't allow to sustain such high popularity, and this is why Russian regime has been tightening the screws back over the last 22 years.

>some people may be scared to tell their opinion to a stranger over the phone

Yet, there is no need to enthusiastically point to a next country. Almost all pointing to the same one is extremely suggestive of it being a genuine result.

>I'm only asking whether you really believe that 75% people support the ongoing war and support starting war with multiple other countries?

Yes. Of course most of those people aren't going to fight themselves. And it will take some time and more sanctions before they start to question the situation. With all the sanctions the life in Russia is still much better than at the beginning of 199x, and until that the Russians feel just fine finding satisfaction in resisting that "American attack on them". And don't forget that "Ukraine was with American help making nuclear and biological weapons to attack Russia".