Trump said in an interview with the Washington Post that he might cancel the meeting, after Russian Federation seized three Ukrainian naval vessels at the weekend. Putin said Poroshenko had done so in a bid to score political points ahead of Ukraine's 2019 presidential election.
Some of Ukraine's Western allies have also raised the possibility of imposing new sanctions on Russia over the episode, which could deliver a blow to the Russian economy.
Speaking at an economic forum in Moscow, he said the West is ready to forgive the shortcomings of Ukrainian politicians because they "propagate anti-Russian narratives", Reuters is reporting.
Trump said he would be receiving a "full report" from his national security team on Russia's recent actions in eastern Ukraine and the Black Sea.
The Ukrainian vessels - a tug and two gunboats - were trying to pass through the Kerch Strait from the Black Sea to the Sea of Azov, but were refused access and chased into worldwide waters by 10 Russian vessels.
"I think it reflects Washington's tendency to indulge any and all action taken by the Kiev regime, even inciting them to provocative actions", Lavrov told reporters in Geneva.
President Poroshenko has implemented martial law across Ukraine's border regions for 30 days in response to the crisis.
The United States and the European Union have both imposed sanctions on Russia over its conduct towards Ukraine since 2014, when Moscow seized and annexed Ukraine's Crimea peninsula after a pro-Russian leader was toppled in Kiev.
APThe Kremlin said on Wednesday it still expected a meeting between President Vladimir Putin and President Donald Trump to go ahead
It has raised fears of a wider escalation - in a conflict that has killed more than 10,000 people since 2014 - and prompted global calls for restraint.
The deployment is likely to have been long-planned, but the timing of the announcement appeared created to send a message to Ukraine and the West that Russian Federation is serious about defending what it regards as its own territory and waters.
The United States also wants its European allies to consider further sanctions against Russian Federation over the situation in Ukraine, the U.S. Special Representative for Ukraine Negotiations said on Wednesday. "In the near future, the new system will enter combat duty to defend Russia's airspace, replacing the previous air defence system", a representative told the official news agency.
Over the last year, the two countries have levied a series of tariffs on hundreds of billions of dollars of imports from one another, with the latest round of U.S. duties set to go into force in the new year.
The Ukrainian ships were trying to pass through the Kerch Strait from the Black Sea into the Sea of Azov.
A court in Simferopol, the capital of Crimea, on Tuesday ordered the other 15 Ukrainian sailors to be detained for two months pending a possible trial.
On Monday, Nato chief Jens Stoltenberg called on Russian Federation to free the Ukrainian ships and sailors and said Moscow should realise the "consequences of its actions".
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