The Ukrainians are trying to expand their own drone industry to create defensive corridors along key sections of the front line, often dubbed the “drone wall.”

Putin retooled the economy to churn out record numbers of tanks and howitzers, while using sizable signing bonuses of up to a year’s salary to raise a massive army.

Mr. Trump, who has intensified criticism of President Vladimir V. Putin of Russia after taking a conciliatory tone for months, insisted that his words “speak pretty loud.”

US President Donald Trump has appeared to set a two-week deadline for Vladimir Putin, threatening a different response if the Russian counterpart was still stringing him along.As the Kremlin escalated its attacks on Ukraine,

The president has been facing pressure from European allies and Republicans in Congress to follow through with financial penalties on Russia.

“He’s killing a lot of people,” Trump said of Putin on Sunday. “I don’t know what’s wrong with him. What the hell happened to him?”

Russia and Ukraine will meet next Monday in Istanbul for a second round of peace talks if the Kremlin produces its promised memorandum of terms for an agreement.

Germany has been the second-biggest supplier of military aid to Ukraine after the United States.

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Germany will provide further military support for Ukraine amounting to around 5 billion euros ($5.65 billion), its defence ministry said on Wednesday, as Ukrainian President Volodymyr Zelenskiy met senior officials in Berlin.