MOSCOW/KYIV, Dec 30 - The Kremlin said on Tuesday its position would toughen in talks on ending the war in Ukraine after accusing Kyiv of attacking a Russian presidential residence, an allegation that Kyiv said was baseless and intended to prolong the conflict.

Kyiv has said Russia's accusations are "lies" aimed at justifying more attacks on Ukraine, and its foreign minister said on Tuesday that Russia had not provided any evidence "because there's none".