Ukraine will let foreign arms companies test out their latest weapons on the front line of its war against Russia's invasion, Kyiv's state-backed arms investment and procurement group Brave1 said on Thursday.

President Volodymyr Zelenskyy says Ukraine plans to boost domestic arms production to meet half its military's needs within six months.

KYIV (Reuters) -Ukraine's newly appointed Prime Minister Yuliia Svyrydenko said on Thursday that her government would be launching a full audit of public finances to achieve "real savings", and that large-scale privatisations should be accelerated.

U.S. President Donald Trump's decision to ramp up arms shipments to Ukraine is a signal to Kyiv to abandon peace efforts, Russia said on Thursday, vowing it would not accept the "blackmail" of Washington's new sanctions ultimatum.

New developments Tuesday reinforced the idea that President Donald Trump has significantly shifted his view of the Ukraine war.

Russia has launched overnight attacks on four Ukrainian cities, injuring at least 15 people and targeting energy infrastructure.

Parliament approved Yulia Svyrydenko as Ukraine's new prime minister on Thursday and backed her plan to cut the number of ministries, merging some of the main portfolios, to save funds in wartime.

As President Donald Trump hardens his position toward Moscow and seeks new ways to bring the conflict to an end, he is leaving open the prospect of allowing shipments of longer-range missiles to the country that would allow it to strike deeper into Russia,