Ukraine on Wednesday urged Poland to adopt a proactive approach to resolving an escalating disagreement between the two countries over Ukrainian grain exports. 

"We urge our Polish friends to put their emotions aside. The Ukrainian side has offered Poland a constructive way to resolve the grain issue," Ukrainian Foreign Ministry spokesman Oleg Nikolenko said after Poland summoned Ukraine's ambassador over the dispute.

Poland's Foreign Ministry said on Wednesday that it had summoned Kyiv's ambassador over remarks by Ukraine's President Volodymyr Zelenskyy at the UN that came amid the grain exports row.

Zelenskyy said some nations feigned solidarity with Ukraine, prompting Warsaw to denounce comments "unjustified concerning Poland, which has supported Ukraine since the first days of the war".

The two countries are now embroiled in a deepening conflict over agricultural imports since Poland, along with Hungary and Slovakia, extended last week a ban on grain imports from Ukraine.

In response, Ukraine said it filed complaints with the World Trade Organization earlier this week against Poland, Slovakia and Hungary over their bans.

(With input from agencies)