Talks to resolve a gas price dispute between Ukraine and Russia are continuing, despite the failure so far to find an agreement, a source close to negotiations has reportedly said.
Ukraine has a deadline of 10.00 GMT tomorrow to pay a $1.95 billion debt or face potentially having its gas supply cut off.
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It reportedly threatened attacks on planes "flying from Heathrow to the US" across the July 4 US Independence Day holiday weekend.
Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.