A ceasefire along the frontline in eastern Ukraine appears to be largely holding after the Ukrainian government declared a "day of silence" in the eight-month war.
AFP reporters said only one artillery shell had been heard since dawn in the main flashpoint city of Donetsk.
Rebel and government sources as well as witnesses confirmed that fighting had halted across the conflict zone.
Ukrainian President Petro Poroshenko said: "We don't have one shot, we don't have any killed soldiers."
Mr Poroshenko was speaking to academics, diplomats and business executives at a public lecture organised by the International Institute for International Studies in Singapore.
He said his country was ready to "stop the bleeding" but not at the expense of "giving up" its freedom, democracy, sovereignty and independence.
He added that the conflict was not a war for Ukraine alone but a "war for freedom, for democracy, for Europe".
The ceasefire appeared to be largely holding despite the delay of planned peace talks between Ukraine and pro-Russian rebels, due to be held in Minsk.
Talks are expected to get under way on Friday.
Meanwhile, Russia has resumed gas flows to Ukraine after halting it six months ago in a dispute over prices and unpaid debts, Ukraine's gas transport monopoly said.
"Ukraine has started receiving Russian gas. The volume of imports is around 43.5 million cubic meters per day," Ukrtrans gaz spokesman Maxim Belyavsky said.
Supplies will flow via the northern Belarusian pipeline of Mozyr and the eastern Sudzha route, he added.
The ex-Soviet republic consumes about 200 million cubic metres on average per day during the winter.
Without Russian gas and short of coal because separatist violence has disrupted domestic coal mining, Ukraine has been forced to introduce widespread power cuts.
With relations poor because of the fighting in Ukraine's east, Russia had insisted that Ukraine pay upfront for renewed supplies over the winter, under an interim agreement in October.
Cash-strapped Ukraine delayed for as long as possible.
However, after a cold snap that sent temperatures plummeting below freezing, Ukrainian state energy firm Naftogaz transferred a $378 million prepayment to Russia's Gazprom to buy 1 billion cubic metres (bcm) of Russian gas in December.
