Russian oil companies will quickly find ways to work around tighter restrictions imposed this month by the US on the foreign finance they can use, multiple Russian oil industry sources told Reuters.

The new restrictions cut the period that US-based entities can provide finance to Russian energy firms from 90 to 60 days and are part of a fresh package of US sanctions that US President Donald Trump approved on August 2.

Initiated by Congress, the sanctions were in part designed to punish Moscow further for its 2014 annexation of Ukraine’s Crimea peninsula and to sanction it for what US intelligence agencies say was its meddling in the US presidential election, something Russia denies.

In particular, the measures were designed to hurt Russia’s energy sector, its biggest source of revenue.

But though the new steps are an inconvenience that could cause Russian oil companies to incur extra costs, the sources, who work for Russian oil firms and Russian and foreign oil trading houses, said that they were only incrementally worse than sanctions that have been in place since 2014. Oil companies had learned to adapt then and would do so again now, they said.

None of the oil trade sources said they knew of any transactions having been disrupted as a result of the new measures.

Still, of all the various measures targeting the energy sector, the restriction cutting the financing duration would have the biggest direct impact even if there were ways to mitigate it, the industry sources said.

The initial sanctions, imposed in 2014 soon after Russia annexed Crimea, effectively cut off Russian energy companies from long-term Western debt of the kind they had used heavily to fund investments in new projects. However, by allowing financing lasting up to 90 days, the initial sanctions kept the door open to trade finance, the routine debt operations that most oil companies depend on.

In crude oil transactions, the selling party usually does not get paid in full until weeks after the shipment of oil has been delivered.

Now that the financing period has been reduced by a third, to 60 days, Russian energy companies will have to become more resourceful, said the industry sources.