Thirteen warships from different NATO countries are heading to Stockholm, Sweden, following the conclusion of their military exercises, according to a report by Swedish daily Aftonbladet.

The warships headed to Stockholm include nine German ships and four ships from Baltic nations, and are headed to Frihamnen Port. The paper said that the ships' movement has nothing to do with the situation in Ukraine.

NATO Secretary-General, Jens Stoltenberg, revealed Sunday that the alliance's member states are pumping more military, humanitarian, and financial support for Ukraine.

"NATO allies are stepping up their support to Ukraine partly by delivering military support, humanitarian support and billions and billions of financial support to Ukraine," said Stoltenberg to NBC News.

The NATO chief claimed that the alliance's responsibility was to ensure that the Ukraine crisis did not get out of control and spread beyond the Ukrainian borders.

"Our allies support Ukraine, but at the same time it is extremely important that we prevent this conflict becoming a full-fledged war between NATO and Russia," Stoltenberg noted, while toying with the possibility to establish a no-fly zone over Ukraine, although Washington affirmed its disinterest in such a move.