"At the same time, we shall not support any pan-European projects involving Russia, especially those undermining our security," the president emphasized.
However, the presidential press office did not specify what projects exactly the head of state was talking about.
Poroshenko earlier called the EU leaders to ban construction of the Nord Stream 2 gas piplene.
Nord Stream 2 is a gas pipeline project intended to secure the transport of natural gas from Russia to Germany across the Baltic Sea, bypassing transit countries.
On March 27, 2017, Naftohaz Ukrainy filed a claim to the European Court of Justice demanding European Commission to revoke its decision of Oct. 28, 2016 which allows the Russian Gazprom to significantly increase the use of OPAL gas pipeline and boost gas deliveries through the Nord Stream.
In December 2016, Ukrainian President Petro Poroshenko and Polish President Andrzej Duda made joint statement calling to review the European Commission's decision, which provided Gazprom the opportunity to increase gas supplies to Europe bypassing Ukraine.
The OPAL gas pipeline connects the offshore Nord Stream pipeline with the gas infrastructure of the Czech Republic. It started operating in 2011.