Russia is pouring reinforcements into eastern Ukraine ahead of a new offensive that could begin next week along a front where there have been relentless battles for months, a Ukrainian governor has said.
Desperate for Western military aid to arrive, Ukraine anticipates a major offensive could be launched by Russia for "symbolic" reasons around the February 24 anniversary of the invasion, which Moscow persists in calling "a special military operation".
Ukraine is itself planning a spring offensive to recapture lost territory, but awaiting delivery of promised longer-range Western missiles and battle tanks, with some analysts saying the country was months away from being ready.
"We are seeing more and more (Russian) reserves being deployed in our direction, we are seeing more equipment being brought in," Luhansk Regional Governor Serhiy Haidai told Ukrainian television.
"They bring ammunition that is used differently than before — it is not round-the-clock shelling anymore.
"They are slowly starting to save, getting ready for a full-scale offensive.
"It will most likely take them 10 days to gather reserves. After February 15 we can expect (this offensive) at any time."
The war is reaching a pivotal point as its first anniversary approaches, with Ukraine no longer making gains as it did in the second half of 2022 and Russia pushing forward with hundreds of thousands of mobilised reserve troops.
President Volodymyr Zelenskyy said personnel changes on the border and frontline will bolster Ukraine's military efforts amid uncertainty over the future of his defence minister, just as Russia advances in the east for the first time in six months.
Britain's Ministry of Defence said in its daily report that Russia's military has likely attempted since early January to restart major offensive operations aimed at capturing Ukraine-held parts of Donetsk.
However, Russian forces have gained little territory as they "lack munitions and manoeuvre units required for a successful offensive", it said.
"Russian leaders will likely continue to demand sweeping advances. It remains unlikely that Russia can buiild up the forces needed to substantially affect the outcome of the war within the coming weeks."
In his Monday evening address, Mr Zelenskyy said he wanted to combine military and managerial experience in local and central government but did not directly address confusion about whether his defence minister, Oleksii Reznikov, would be replaced.
On Sunday, David Arakhamia, leader of Mr Zelenskyy's parliamentary party, said Mr Reznikov would be transferred to another ministerial job, but on Monday he wrote that "there will be no personnel changes in the defence sector this week."
Mr Zelenskyy said he needs to show that Ukraine was a safe steward of billions of dollars of Western military and other aid, and his government is engaged in the biggest political and administrative shake-up since Russia's invasion nearly a year ago.
"In a number of regions, particularly those on the border or on the front line, we will appoint leaders with military experience," he said.
"Those who can show themselves to be the most effective in defending against existing threats."
The European Union said Mr Zelenskyy has been invited to take part in a summit of EU leaders, amid reports he could be in Brussels as soon as this week, in what would be only his second-known foreign trip since the invasion began.
The president's office did not respond to a request for comment.
New offensive 'could come from one of four directions'
Ukraine's Defence Minister Oleksii Reznikov said intelligence suggests any new Russian offensive would likely come from the east or south.
"Their dream is to expand the land corridor to Crimea in order to continue supplies. Therefore, of course, the key risks are: the east, the south, and after that the north," he told Ukrainska Pravda at the weekend
Moscow annexed Crimea in 2014.
Ukrainian defence analyst Oleksandr Kovalenko said a new Russian offensive could come from one of four directions; the eastern Luhansk region, the Donetsk region, the Zaporizhzhia region and the city and port of Mariupol.
"Things are more serious in Donetsk region, particularly around Bakhmut and Avdiivka," Mr Kovalenko, from the Information Resistance group think tank, told Ukrainian radio NV.
"And the Russians will be boosting their contingents there as well as equipment and paratroopers."
Mr Kovalenko said Mariupol, captured by Russian forces last May, could be used by the Russians to bring in troops and equipment for a new offensive.
"It could serve as a transport hub for the Russian occupation forces," he said.
Mr Kovalenko said Ukraine's counteroffensive would not happen any time soon and Ukrainian forces would be assuming a defensive position, particularly in Donetsk.
"It may be an active defence, but a defensive position nonetheless. The idea will remain to block any Russian advance," he said.
Reuters