Ukrainian President, Volodymyr Zelensky has signed into law a bill lowering the military mobilisation age by two years from 27 to 25.
Kyiv has faced heavy losses on the battlefield after two years of war, whereas Russia has benefited from a sizeable advantage in manpower.
The move will allow Ukraine to call up more people to replenish its reserves after volunteer numbers dropped.
Zelensky said in December that 500,000 more soldiers were needed.
Ukraine’s parliament approved the bill in May 2023, but it did not come into force because Mr Zelensky did not sign it.
In a separate move, NATO foreign ministers in Brussels were due to consider plans for a €100bn (£86bn) five-year fund to provide long-term military support for Ukraine.
Asked if the figure was correct, Nato Secretary General Jens Stoltenberg said the framework was yet to be decided but Nato allies agreed that Ukraine needed more money and for many years.
Russia was “pushing” on the battlefield in Ukraine and trying to win the war by “waiting us out”, he said.
It was not immediately clear what prompted President Zelensky to approve a law to lower the age of mobilisation, although he has previously warned of plans Russia may have to launch a spring or summer offensive this year.
His decision could signify Ukraine’s effort to build up strong defensive fortifications in preparation for a Russian offensive.
Ukraine has relied heavily on Western supplies, particularly on deliveries of long-range missiles and air defence systems. However, billions of pounds of US and EU aid have been held up amid political wrangles.
Russian President, Vladimir Putin has said more than 600,000 of his troops are fighting in Ukraine but has not revealed how many have lost their lives there.
In February, Zelensky said 31,000 Ukrainian soldiers had been killed since the start of the war, but US officials have put the number of Ukrainian soldiers killed as at least 70,000 and as many as 120,000 injured.
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