When asked today whether attempts by Ukraine to retake the territories of the Donbass after those territories become a part of Russia will be regarded as an attack on Russia, Presidential Press Secretary Dmitry Peskov was clear: “Certainly. Immediately, the Constitution of the Russian Federation will come into force in relation to these territories, where everything is very clearly stated on this score.” The relevant provisions of the Russian Constitution will be in effect from the moment the republics join Russia.
As for the timing of that process, Peskov said that if the referenda in those territories decide the territories of the Donbass should become a part of Russia, the process of accession will take place quickly enough and in full accordance with Russian legislation. Both the parliament and the president have to accept the decision, and there is a series of procedures required for the signing of the necessary documents. How long would the recognition process take? “I can’t say for sure right now. I’m actually convinced that it will be fast enough,” Peskov replied. (https://www.interfax.ru/russia/863624 )