Some of them certainly do. Even when phrased as broadly as "Ukraine should join Russia". These were the results of a poll conducted between 8-18 February 2014. That's about a month before Russian troops evicted the Ukrainian ones from Crimea, i.e. it was among the last polls conducted before there was open territorial conflict between Russia and Ukraine.
If I need to add this: last fall Russia conducted referendums on joining [it] in the territories it recently occupied. Official results were in the 99% ballpark, with turnout claimed above 95% as well.
According to the results released by the Russian Central Election Commission through its sections in the DPR and the LPR, 99.23% (2,116,800 voters) supported the annexation in Donetsk and 98.42% (1,636,302 voters) in Luhansk. The turnouts were 97.51% (2,131,207 voters) and 94.15% (1,662,607 voters), respectively.
Russia even claimed these were monitored by international observers, but that has been disputed because none of the usual organizations officially participated.
As for the present state of affairs, anybody not accepting Russian citizenship by next summer will be considered a foreigner, according to a recent decree (№ 307 of 27.04.2023) signed by Putin, and measures against these have been spelled out (in the same) to include everything up to deportation, so the Q might be be becoming tautological.
б) реализацию мер,
исключающих применение административного выдворения за пределы Российской Федерации в форме принудительного выдворения за пределы Российской Федерации, депортации или реадмиссии при принятии решений о привлечении к административной ответственности лиц, названных в пункте 1 настоящего Указа, а до 1 июля 2024 г. в пунктах 2 и 9 настоящего Указа; - лиц, названных
в) с 1 января 2024 г. предоставление органами внутренних дел Российской Федерации на территориях Донецкой Народной Республики, Луганской Народной Республики, Запорожской области и Херсонской области государственных услуг в сфере миграции и реализацию функций этих органов на указанных территориях в полном объеме.
Ostensibly only those [foreigners] who "pose a threat to national security" are subject to such measures (by this decree), but given e.g. that holding a poster saying "no to war" is commonly interpreted as "discrediting the Russian army" by the Russian courts, it's anybody's guess how broadly this recent decree might be interpreted.