Crude prices were largely unchanged on Tuesday, with traders weighing the potential fallout from Ukrainian drone attacks on Russian energy facilities and rising diplomatic strain between the United States and Venezuela.

Democratic Sen. Chris Van Hollen said Sunday he believes "it's very possible there was a war crime committed" in the first strike on an alleged drug trafficking boat.

The White House is moving swiftly to tighten legal immigration reviews after two National Guard members were shot last week. And, Ukraine enters a new round of negotiations to end the war with Russia.

Professor Michael Clarke has been answering your questions on the Ukraine war - catch up below. Among the topics he addressed are history's view of Trump and Putin - and comments from a NATO officer this week about a "pre-emptive strike".

From Ukrainian drone strikes on Russian energy infrastructure to renewed friction between the US and Venezuela, traders continued to watch for any signals that could tilt global oil balances.

Crude oil futures traded higher on Tuesday morning as markets analysed the impact of Ukrainian attacks on Russian energy infrastructure over the weekend and US President Donald Trump’s threat to close airspace over Venezuela.

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President Donald Trump confirms he spoke with Venezuelan President Nicolás Maduro by phone but did not go into detail about what was said. NBC News’ Monica Alba reports on whether the call is any indication that U.