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Per a Wall St. Journal poll:
"Trump leads Harris among swing-state voters, 50% to 39%, on who is best able to handle Russia’s war in Ukraine and has a wider advantage, 48% to 33%, on who is better suited to handle the Israel-Hamas war."
The Wall St. Journal is paywalled, so I don't know whether this is a poll of registered or some modeling of "likely" voters.
All that said, I think we ought to be very cautious about assuming Harris will win, given that voters seem to trust Trump more on the economy, immigration, and now on wars. They are seriously, dangerously wrong, but they will determine who wins the election in each state unless the Supreme Court annuls their votes or there is some other kind of theft. This poll may have the same problems as others, and their models may be flawed, but if they're not, we should consider Harris in danger and act accordingly.