Russia is dropping deadly cluster bombs in Ukraine and there will be more death and destruction in the coming days, a NATO chief has said.
Secretary-General Jens Stoltenberg said Moscow's troops will likely bring in "heavier weaponry" as the brutal conflict entered its eighth day.
"The days to come are likely to be worse with more death, more suffering and more destruction," he told a press conference in Brussels.
Mr Stoltenberg backed reports that some of the devastation has been caused by cluster bombs, which open mid air and drop smaller bombs over a wider area.
Use of these weapons in civilian areas is banned under international law.
Mr Stoltenberg said: "We have seen the use of cluster bombs and we have seen reports of use of other types of weapons which would be in violation of international law."
But the NATO chief insisted that the alliance would not send troops into Ukraine or enforce a no-fly zone.
"Allies agree we should not have NATO planes operating in Ukrainian air space or NATO troops on Ukraine's territory," he said.
It coms as Dominic Raab warned that Russia could deploy ever more barbaric" tactics to crush Ukrainian resistance.
The Deputy PM said economic sanctions on Russia are "starting to bite", but admitted Britain and allies need to "bed in and have the strategic stamina for the long haul".
He added: "I've said that we can expect that, after the stuttering start to this campaign, that Putin would resort to ever more barbaric measures as he gets frustrated - and that is the next phase that we all need to be alert to, whether it is the sanctions or the steeling of the capacity and the will of the Ukrainian defence."
Ministers are under mounting pressure to slap the Kremlin with tougher measures.
Quizzed about Roman Abramovich and the sale of Chelsea FC, Mr Raab said: "We don't talk about individual cases before the sanctions are imposed.
"We have overnight imposed sanctions on Mr (Alisher) Usmanov and (Igor) Shuvalov, but the reason we do it is, first of all, precisely because it is contested and, as Justice Secretary, I can't prejudge these things.
"But, more importantly, we do not want to give advance sight to anyone of the measures that we take."
Labour chairwoman Anneliese Dodds said: She said: "For many, many years, Labour has been calling on the Conservatives to, for example, force transparency around property ownership, especially in London where we know that many of these Putin-linked oligarchs have been stashing their funds in property.
"We see, even with the new measures that finally have been extracted from the Government now that they say they will announce on Monday, an 18-month window before they will come into action - that's just not good enough.
"We need immediate action now. We can put those registers of foreign-owned property into place in 28 days, we believe we could get those running and force that transparency.”
Meanwhile, Foreign Secretary Liz Truss joined crisis talks held by NATO, G7 and EU foreign ministers in Brussels.
