TY JOUR TI Requirement for presidential candidates of Russia on the absence of foreign citizenship in the past and the principle of equal citizenship: the problem definition KW Constitution of the Russian Federation KW President of the Russian Federation KW presidential elections KW electoral qualification KW citizenship qualification KW passive suffrage KW constitutional modernization KW nationalization of the elite KW acquisition of citizenship KW filiation JO Legal Science and Practice: Journal of Nizhny Novgorod Academy of the Ministry of Internal Affairs of Russia AU Lapshin, I.S. PY 2021 IS 2021 PB Nizhny Novgorod Academy of the Ministry of the Interior of Russia