Ukrainian President Petro Poroshenko on Saturday tweeted a picture of himself alongside three U.S. senators at a military command post in Ukraine.

Poroshenko said in the tweet that he arrived at the military base with Sens. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.), Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) and Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) to wish Ukrainian soldiers a happy new year.

In another tweet, the Ukrainian leader promised that Russian occupation of some parts of the country is only temporary, calling for unity.

Прибув на командний пункт в районі Широкіно з Джоном Маккейном, Ліндсі Гремом та Емі Клобучар, щоб привітати наших Воїнів з Новим роком pic.twitter.com/kj2b98kFJ7 — Петро Порошенко (@poroshenko) December 31, 2016

Дорогі наші співвітчизники! Російська окупація – тимчасова. Ми обов’язково об’єднаємося. Україна – єдина, і ми єдині. Слава Україні! — Петро Порошенко (@poroshenko) December 31, 2016

McCain also tweeted photos of his own from the trip.

Checking out a battlefield souvenir from Marine commander in #Ukraine: the base of a 125mm tank shell pic.twitter.com/ch70Y4xJdE — John McCain (@SenJohnMcCain) December 31, 2016

Spending #NewYearsEve w/ brave #Ukrainian Marines at a forward combat outpost - we stand w/ them in their fight against #Putin's aggression pic.twitter.com/vkz0gdozVV — John McCain (@SenJohnMcCain) December 31, 2016

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Earlier in the week, both McCain and Graham urged the U.S. to hit back at Russia over Kremlin interference in the presidential election.



"You can do a number of things," McCain told Fox News, including strengthening sanctions agains Russia, increasing U.S. presence in the Baltic countries and giving "defensive weapons to Ukraine so that they can defend themselves."

Both U.S. lawmakers were in Europe on a tour of the Baltic states.