Notably, Putin declared the annexation of four Moscow-held regions of Ukraine on September 30 in a signing ceremony. He made the announcement regarding annexation after Russian-held regions of Ukraine organised referendums to join Russia. The international treaties specify the establishment of the border of the new regions. The borders of the regions will be based on how they "existed on the day of their establishment and accession to Russia," as per the news report.
According to international treaties, the borders near the foreign country's region will now be regarded as Russia's state border. The regions will retain their current names and the heads of the region will be declared governors. As per the news report, Putin will appoint the acting heads of the regions within 10 days of their accession to Russia. The government in the regions that have been annexed by Vladimir Putin will be set up by acting governors as per Russian legislation.
Photo source: picture from an open source