Pressure is growing on US President Joe Biden to allow Ukraine to use West-supplied weapons to strike Russian territory.
A number of US allies this week signalled they were open to this possibility, after months of concern about escalation.
Russia's Vladimir Putin has warned of serious consequences, especially for what he called small countries in Europe.
On Wednesday, US Secretary of State Antony Blinken said Washington's stance on the matter would adapt and adjust based on changing battlefield conditions.
He is currently in the Czech capital, Prague, for a meeting of NATO foreign ministers.
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