President Duda welcomed British PM Boris Johnson in Warsaw

British Prime Minister Boris Johnson met Polish President Andrzej Duda on Thursday amid tensions over the security situation in Ukraine.

Presdient Duda's aide Jakub Kumoch said on twitter after the meeting that the two held "very interesting" talks.

Poland and Britain have a very clear and close standpoint regarding security issues," Kumoch wrote, attaching a photo of Duda and Johnson talking.

Johnson met his Polish counterpart Mateusz Morawiecki and visited NATO troops earlier that day.

The visits come as Western countries are working to de-escalate the situation on the Ukrainian border, where thousands of Russian troops are gathered.

British soldiers landed in Warsaw on Thursday, part of a further 350 troops to Poland, after it sent 100 troops last year to help with a migrant crisis at its border with Belarus.

The country also ordered 1,000 troops to be on a state of readiness to provide support in the event of a humanitarian crisis caused by any Russian aggression in Ukraine.

Russia denies Western accusations that it may be planning to invade Ukraine though it says it could take unspecified "military-technical" action unless demands are met.

Putin, who says that Moscow's concerns over NATO enlargement have been ignored for three decades, has demanded guarantees that there will be no missile deployments near its borders and no further enlargement of NATO.

Britain has backed a strong line that Russia should not be able to veto countries choosing to join the Western alliance.