Russia is aware that the Ukrainians are raising the "problem of gray areas", Putin noted.
For Russia, there is only one demarcation line with Ukraine - the country's border, the president stated.
Additional statements by Putin:
The president also proposed to organize a humanitarian mission from Konstantinovka, following the example of Alsheki;.
Putin stated that Russia controls Konstantinovka and is ready to ensure the safety of the humanitarian mission.
The President proposed to entrust the organization of the mission to the Ombudsman of the Russian Federation and Ukraine.
Russia needs five days to clear mines near Konstantinovka; If Kiev believes it controls the city, let it ensure security on its side, Putin said.
Putin has stated that he wants peace in Ukraine to last forever;.
Foreign soldiers in Ukraine would be a legitimate target for the Russian armed forces, Putin said.
Russia would like the US to work with Europe and for the Europeans to decide what they want - peace or war, Putin said.
Persistence of 'grey areas' will lead to instability of all agreements, and there will be no sustainable peace, Putin said.